# Screen flickering at 4k@60hz **URL:** \ **Category:** Linux\ **Created:** [August 1, 2017, 7:45pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162 "2017-08-01T19:45:19Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 1, 2017, 7:45pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/1 "2017-08-01T19:45:19Z")
Hi guys, I’ve just faced with a problem of distorted and flickered display image in ubuntu 17.04 with the latest nvidia drivers 384.59 with 4k@60hz resolution. 4k@30hz works just fine. 4k@60hz works fine on the same computer under windows 10 and macos 10.12.5 and macos 10.11.6 I extracted edid of the monitor, it is here: ```auto Monitor Asset Manager Report, generated 01.08.2017 Copyright (c) 1995-2016, EnTech Taiwan. --------------------------- Monitor #1 [Real-time 0x0071] Model name............... SE42UMS Manufacturer............. Seiki Plug and Play ID......... SEK0030 Serial number............ Manufacture date......... 2015, ISO week 22 Filter driver............ None ------------------------- EDID revision............ 1.3 Input signal type........ Digital Color bit depth.......... Undefined Display type............. RGB color Screen size.............. 930 x 520 mm (41,9 in) Power management......... Not supported Extension blocs.......... 1 (CEA-EXT) ------------------------- DDC/CI................... Not supported Color characteristics Default color space...... Non-sRGB Display gamma............ 2,20 Red chromaticity......... Rx 0,640 - Ry 0,340 Green chromaticity....... Gx 0,300 - Gy 0,690 Blue chromaticity........ Bx 0,138 - By 0,038 White point (default).... Wx 0,282 - Wy 0,297 Additional descriptors... None Timing characteristics Horizontal scan range.... 30-80kHz Vertical scan range...... 50-75Hz Video bandwidth.......... 230MHz CVT standard............. Not supported GTF standard............. Not supported Additional descriptors... None Preferred timing......... Yes Native/preferred timing.. 3840x2160p at 30Hz (16:9) Modeline............... "3840x2160" 297,000 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync Standard timings supported 640 x 480p at 60Hz - IBM VGA 800 x 600p at 60Hz - VESA 1024 x 768p at 60Hz - VESA 1280 x 1024p at 60Hz - VESA STD 800 x 600p at 60Hz - VESA STD 1024 x 768p at 60Hz - VESA STD 1440 x 900p at 60Hz - VESA STD EIA/CEA-861 Information Revision number.......... 3 IT underscan............. Supported Basic audio.............. Supported YCbCr 4:4:4.............. Supported YCbCr 4:2:2.............. Supported Native formats........... 2 Detailed timing #1....... 720x480p at 60Hz (16:9) Modeline............... "720x480" 27,000 720 736 798 858 480 489 495 525 -hsync -vsync Detailed timing #2....... 720x576p at 50Hz (16:9) Modeline............... "720x576" 27,000 720 732 796 864 576 581 586 625 -hsync -vsync Detailed timing #3....... 1280x720p at 50Hz (16:9) Modeline............... "1280x720" 74,250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync CE video identifiers (VICs) - timing/formats supported 640 x 480p at 60Hz - Default (4:3, 1:1) 720 x 480p at 60Hz - EDTV (16:9, 32:27) 1280 x 720p at 60Hz - HDTV (16:9, 1:1) 1920 x 1080i at 60Hz - HDTV (16:9, 1:1) 720 x 480i at 60Hz - Doublescan (16:9, 32:27) 1920 x 1080p at 60Hz - HDTV (16:9, 1:1) [Native] 720 x 576p at 50Hz - EDTV (16:9, 64:45) 1280 x 720p at 50Hz - HDTV (16:9, 1:1) 1920 x 1080i at 50Hz - HDTV (16:9, 1:1) 720 x 576i at 50Hz - Doublescan (16:9, 64:45) 1920 x 1080p at 50Hz - HDTV (16:9, 1:1) [Native] 1920 x 1080p at 24Hz - HDTV (16:9, 1:1) 1920 x 1080p at 30Hz - HDTV (16:9, 1:1) NB: NTSC refresh rate = (Hz*1000)/1001 CE audio data (formats supported) LPCM 2-channel, 16/20/24 bit depths at 32/44/48 kHz AC-3 2-channel, 640k max. bit rate at 32/44/48/96 kHz CE speaker allocation data Channel configuration.... 2.0 Front left/right......... Yes Front LFE................ No Front center............. No Rear left/right.......... No Rear center.............. No Front left/right center.. No Rear left/right center... No Rear LFE................. No CE vendor specific data (VSDB) IEEE registration number. 0x000C03 CEC physical address..... 1.0.0.0 Supports AI (ACP, ISRC).. Yes Supports 48bpp........... No Supports 36bpp........... Yes Supports 30bpp........... Yes Supports YCbCr 4:4:4..... Yes Supports dual-link DVI... No Maximum TMDS clock....... 300MHz Audio/video latency (p).. n/a Audio/video latency (i).. n/a HDMI video capabilities.. Yes EDID screen size......... No additional info 3D formats supported..... Not supported Data payload............. 030C001000B83C200060010203 Reserved video related data Data payload............. 0E6061 Report information Date generated........... 01.08.2017 Software revision........ 2.90.0.1020 Data source.............. Real-time 0x0071 Operating system......... 10.0.15063.2 Raw data 00,FF,FF,FF,FF,FF,FF,00,4C,AB,30,00,01,00,00,00,16,19,01,03,80,5D,34,78,0A,CF,74,A3,57,4C,B0,23, 09,48,4C,21,08,00,81,80,45,40,61,40,95,00,01,01,01,01,01,01,01,01,04,74,00,30,F2,70,5A,80,B0,58, 8A,00,BA,89,21,00,00,1E,00,00,00,FF,00,0A,20,20,20,20,20,20,20,20,20,20,20,20,00,00,00,FC,00,53, 45,34,32,55,4D,53,0A,20,20,20,20,20,00,00,00,FD,00,32,4B,1E,50,17,00,0A,20,20,20,20,20,20,01,4E, 02,03,2F,F2,4D,01,03,04,05,07,90,12,13,14,16,9F,20,22,26,09,07,07,11,17,50,83,01,00,00,6D,03,0C, 00,10,00,B8,3C,20,00,60,01,02,03,E3,0E,60,61,8C,0A,D0,8A,20,E0,2D,10,10,3E,96,00,C4,8E,21,00,00, 18,8C,0A,D0,90,20,40,31,20,0C,40,55,00,C4,8E,21,00,00,18,01,1D,00,BC,52,D0,1E,20,B8,28,55,40,C4, 8E,21,00,00,1E,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,19 --------------------------- Hardware data BUS_SLOT = PCI00000.PCI00004.PCI00008.PCI0000C.PCI00010.PCI00014.PCI00018.PCI0001C 00000000 = 2F008086.00100400.06000001.00000010.00000000.00000000.00000000.00000000 00000008 = 2F028086.00100404.06040001.00010010.00000000.00000000.00010100.000000F0 00000018 = 2F088086.00100407.06040001.00010010.00000000.00000000.00020200.2000E0E0 00000028 = 2F288086.00100000.08800001.00800010.00000000.00000000.00000000.00000000 00000029 = 2F298086.00100000.08800001.00000010.00000000.00000000.00000000.00000000 0000002A = 2F2A8086.00100000.08800001.00800010.00000000.00000000.00000000.00000000 0000002C = 2F2C8086.00100006.08002001.00800010.FB33E000.00000000.00000000.00000000 00000088 = 8D7C8086.00100000.FF000005.00800010.00000000.00000000.00000000.00000000 0000008C = 8D628086.02B00407.01060105.00000000.0000F131.0000F121.0000F111.0000F101 000000A0 = 8D318086.02900006.0C033005.00000000.FB320004.00000000.00000000.00000000 000000B0 = 8D3A8086.00100406.07800005.00800000.FB33C004.00000000.00000000.00000000 000000C8 = 15A18086.00100406.02000005.00000000.FB300000.FB339000.00000001.00000000 000000D0 = 8D2D8086.02900006.0C032005.00000000.FB338000.00000000.00000000.00000000 000000D8 = 8D208086.00100006.04030005.00000010.FBFF8004.00000000.00000000.00000000 000000E0 = 8D108086.00100404.060400D5.00810010.00000000.00000000.00030300.200000F0 000000E8 = 8D268086.02900006.0C032005.00000000.FB337000.00000000.00000000.00000000 000000F8 = 8D478086.02100007.06010005.00800000.00000000.00000000.00000000.00000000 000000FA = 8D028086.02B00407.01060105.00000000.0000F091.0000F081.0000F071.0000F061 000000FB = 8D228086.02800001.0C050005.00000000.FB335004.00000000.00000000.00000000 00000200 = 140210DE.00100007.030000A1.00800010.FA000000.E000000C.00000000.F000000C 00000201 = 0FBA10DE.00100006.040300A1.00800010.FB080000.00000000.00000000.00000000 00000400 = 34831106.00180400.0C033001.00000010.FB200004.00000000.00000000.00000000 00000500 = 12421B21.00100400.0C033000.00000010.FB100004.00000000.00000000.00000000 0000FF58 = 2F818086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF59 = 2F368086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF5A = 2F378086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF60 = 2FE08086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF61 = 2FE18086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF62 = 2FE28086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF63 = 2FE38086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF64 = 2FE48086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF65 = 2FE58086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF66 = 2FE68086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF67 = 2FE78086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF78 = 2FF88086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF79 = 2FF98086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF7A = 2FFA8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF7B = 2FFB8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF7C = 2FFC8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF7D = 2FFD8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF7E = 2FFE8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF80 = 2F1D8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF81 = 2F348086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF85 = 2F1E8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF86 = 2F7D8086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF87 = 2F1F8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF90 = 2FA08086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF91 = 2F308086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF94 = 2F608086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF95 = 2F388086.00000000.11010001.00800000.00000000.00000000.00000000.00000000 0000FF98 = 2FA88086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF99 = 2F718086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF9A = 2FAA8086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF9B = 2FAB8086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF9E = 2FAE8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FF9F = 2FAF8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA0 = 2FB08086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA1 = 2FB18086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA2 = 2FB28086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA3 = 2FB38086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA4 = 2FBC8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA5 = 2FBD8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA6 = 2FBE8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFA7 = 2FBF8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB0 = 2F688086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB1 = 2F798086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB2 = 2F6A8086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB3 = 2F6B8086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB6 = 2F6E8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB7 = 2F6F8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB8 = 2FD08086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFB9 = 2FD18086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBA = 2FD28086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBB = 2FD38086.00100000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBC = 2FB88086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBD = 2FB98086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBE = 2FBA8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFBF = 2FBB8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFF0 = 2F988086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFF1 = 2F998086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFF2 = 2F9A8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFF3 = 2FC08086.00000000.08800001.00800000.00000012.00000000.00000000.00000000 0000FFF4 = 2F9C8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFF8 = 2F888086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 0000FFFA = 2F8A8086.00000000.08800001.00800000.00000000.00000000.00000000.00000000 -------- 01070000 = 00FFFFFF.FFFFFF00.4CAB3000.01000000.16190103.805D3478.0ACF74A3.574CB023 00000020 = 09484C21.08008180.45406140.95000101.01010101.01010474.0030F270.5A80B058 00000040 = 8A00BA89.2100001E.000000FF.000A2020.20202020.20202020.20200000.00FC0053 00000060 = 45343255.4D530A20.20202020.000000FD.00324B1E.5017000A.20202020.2020014E 01070100 = 02032FF2.4D010304.05079012.1314169F.20222609.07071117.50830100.006D030C 00000020 = 001000B8.3C200060.010203E3.0E60618C.0AD08A20.E02D1010.3E9600C4.8E210000 00000040 = 188C0AD0.90204031.200C4055.00C48E21.00001801.1D00BC52.D01E20B8.285540C4 00000060 = 8E210000.1E000000.00000000.00000000.00000000.00000000.00000000.00000019 ``` I also made a picture of the screen, but don’t know how to attach it. It doubles the image in upper part of the screen and flickers in the bottom. Also the colors are strange. I tried the workaround from here [https://devtalk.nvidia.com/default/topic/939971/linux/4k-60hz-works-in-windows-not-in-linux-workaround-found-/3](https://devtalk.nvidia.com/default/topic/939971/linux/4k-60hz-works-in-windows-not-in-linux-workaround-found-/3) but it does not work for me. How to fix this problem? Thank you, Dmitry ![IMG_4151.JPG](https://global.discourse-cdn.com/nvidia/original/2X/4/4ba31305ab245b9c8e1f8037250355816919e840.jpeg) ![IMG_4151.JPG](https://global.discourse-cdn.com/nvidia/original/2X/4/4ba31305ab245b9c8e1f8037250355816919e840.jpeg) ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 2, 2017, 7:47am UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/2 "2017-08-02T07:47:04Z")
I also exported this monitor edid from switchresx running in macos 10.12.6. It seems to be a bit more verbose. ```auto EDID report generated by SwitchResX Version 4.6.4 (x64) for display SE42UMS ----------------------------------------------------- ------------------- RAW DATA ------------------------ ----------------------------------------------------- 0 1 2 3 4 5 6 7 8 9 A B C D E F ----------------------------------------------------- 0 | 00 FF FF FF FF FF FF 00 4C AB 30 00 01 00 00 00 1 | 16 19 01 03 80 5D 34 78 0A CF 74 A3 57 4C B0 23 2 | 09 48 4C 21 08 00 81 80 45 40 61 40 95 00 01 01 3 | 01 01 01 01 01 01 04 74 00 30 F2 70 5A 80 B0 58 4 | 8A 00 BA 89 21 00 00 1E 00 00 00 FF 00 0A 20 20 5 | 20 20 20 20 20 20 20 20 20 20 00 00 00 FC 00 53 6 | 45 34 32 55 4D 53 0A 20 20 20 20 20 00 00 00 FD 7 | 00 32 4B 1E 50 17 00 0A 20 20 20 20 20 20 02 4D ----------------------------------------------------- 0 1 2 3 4 5 6 7 8 9 A B C D E F ----------------------------------------------------- 0 | 02 03 2F F2 4D 01 03 04 05 07 90 12 13 14 16 9F 1 | 20 22 26 09 07 07 11 17 50 83 01 00 00 6D 03 0C 2 | 00 10 00 B8 3C 20 00 60 01 02 03 E3 0E 60 61 8C 3 | 0A D0 8A 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 4 | 18 8C 0A D0 90 20 40 31 20 0C 40 55 00 C4 8E 21 5 | 00 00 18 01 1D 00 BC 52 D0 1E 20 B8 28 55 40 C4 6 | 8E 21 00 00 1E 00 00 00 00 00 00 00 00 00 00 00 7 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 19 ----------------------------------------------------- 0 1 2 3 4 5 6 7 8 9 A B C D E F ----------------------------------------------------- 0 | 70 11 24 03 00 03 00 14 07 E8 00 00 FF 0E 2F 02 1 | AF 80 57 00 6F 08 59 00 07 80 09 00 0B 00 0A 53 2 | 77 69 74 63 68 52 65 73 58 95 00 00 00 00 00 00 3 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 ----------------------------------------------------- < 00FFFFFF FFFFFF00 4CAB3000 01000000 16190103 805D3478 0ACF74A3 574CB023 09484C21 08008180 45406140 95000101 01010101 01010474 0030F270 5A80B058 8A00BA89 2100001E 000000FF 000A2020 20202020 20202020 20200000 00FC0053 45343255 4D530A20 20202020 000000FD 00324B1E 5017000A 20202020 2020024D 02032FF2 4D010304 05079012 1314169F 20222609 07071117 50830100 006D030C 001000B8 3C200060 010203E3 0E60618C 0AD08A20 E02D1010 3E9600C4 8E210000 188C0AD0 90204031 200C4055 00C48E21 00001801 1D00BC52 D01E20B8 285540C4 8E210000 1E000000 00000000 00000000 00000000 00000000 00000000 00000019 70112403 00030014 07E80000 FF0E2F02 AF805700 6F085900 07800900 0B000A53 77697463 68526573 58950000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000090 > ----------------------------------------------------- { 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x4C, 0xAB, 0x30, 0x00, 0x01, 0x00, 0x00, 0x00, 0x16, 0x19, 0x01, 0x03, 0x80, 0x5D, 0x34, 0x78, 0x0A, 0xCF, 0x74, 0xA3, 0x57, 0x4C, 0xB0, 0x23, 0x09, 0x48, 0x4C, 0x21, 0x08, 0x00, 0x81, 0x80, 0x45, 0x40, 0x61, 0x40, 0x95, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x04, 0x74, 0x00, 0x30, 0xF2, 0x70, 0x5A, 0x80, 0xB0, 0x58, 0x8A, 0x00, 0xBA, 0x89, 0x21, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x53, 0x45, 0x34, 0x32, 0x55, 0x4D, 0x53, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x32, 0x4B, 0x1E, 0x50, 0x17, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x02, 0x4D, 0x02, 0x03, 0x2F, 0xF2, 0x4D, 0x01, 0x03, 0x04, 0x05, 0x07, 0x90, 0x12, 0x13, 0x14, 0x16, 0x9F, 0x20, 0x22, 0x26, 0x09, 0x07, 0x07, 0x11, 0x17, 0x50, 0x83, 0x01, 0x00, 0x00, 0x6D, 0x03, 0x0C, 0x00, 0x10, 0x00, 0xB8, 0x3C, 0x20, 0x00, 0x60, 0x01, 0x02, 0x03, 0xE3, 0x0E, 0x60, 0x61, 0x8C, 0x0A, 0xD0, 0x8A, 0x20, 0xE0, 0x2D, 0x10, 0x10, 0x3E, 0x96, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x18, 0x8C, 0x0A, 0xD0, 0x90, 0x20, 0x40, 0x31, 0x20, 0x0C, 0x40, 0x55, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x18, 0x01, 0x1D, 0x00, 0xBC, 0x52, 0xD0, 0x1E, 0x20, 0xB8, 0x28, 0x55, 0x40, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x19, 0x70, 0x11, 0x24, 0x03, 0x00, 0x03, 0x00, 0x14, 0x07, 0xE8, 0x00, 0x00, 0xFF, 0x0E, 0x2F, 0x02, 0xAF, 0x80, 0x57, 0x00, 0x6F, 0x08, 0x59, 0x00, 0x07, 0x80, 0x09, 0x00, 0x0B, 0x00, 0x0A, 0x53, 0x77, 0x69, 0x74, 0x63, 0x68, 0x52, 0x65, 0x73, 0x58, 0x95, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x90 } ----------------------------------------------------- Valid EDID block #0: checksum ok Valid EDID block #1: checksum ok Valid EDID block #2: checksum ok ----------------------------------------------------- ------------------- MAIN EDID BLOCK ----------------- ----------------------------------------------------- EDID Version........1.3 Manufacturer........SEK (4CAB) Product ID..........48 (0030) Serial Number.......00000001 Manufactured........Week 22 of year 2015 Max H Size..........93 cm Max V Size..........52 cm Gamma...............2.20 Display Supported Features: --------------------------- Display type: ------------- RGB 4:4:4 & YCrCb 4:4:4 Color Encoding Formats Display is non continuous frequency Default color space is not sRGB standard Preferred timing mode includes Native Pixel Format Input signal & sync: -------------------- Digital Input Color Bit Depth is undefined Digital Interface is not defined Color info: ----------- Red x = 0.640 Green x = 0.300 Blue x = 0.138 White x = 0.282 Red y = 0.340 Green y = 0.690 Blue y = 0.038 White y = 0.297 Established Timings: -------------------- 640 x 480 @ 60Hz 800 x 600 @ 60Hz 1024 x 768 @ 60Hz Manufacturer Reserved Timings: ------------------------------ Standard Timing Identification: ------------------------------- #0: 1280 x 1024 @ 60Hz (8180) #1: 800 x 600 @ 60Hz (4540) #2: 1024 x 768 @ 60Hz (6140) #3: 1440 x 900 @ 60Hz (9500) Monitor Description blocks: --------------------------- Descriptor #0 - Timing definition: Mode = 3840 x 2160 @ 30.000Hz Pixel Clock............. 297.00 MHz Non-Interlaced Horizontal Vertical Active.................. 3840 pixels 2160 lines Front Porch............. 176 pixels 8 lines Sync Width.............. 88 pixels 10 lines Back Porch.............. 296 pixels 72 lines Blanking................ 560 pixels 90 lines Total................... 4400 pixels 2250 lines Scan Rate............... 67.500 kHz 30.000 Hz Image Size.............. 698 mm 393 mm Border.................. 0 pixels 0 lines Sync: Digital separate with * Positive vertical polarity * Positive horizontal polarity Descriptor #1 - Serial number: Descriptor #2 - Monitor name: SE42UMS Descriptor #3 - Monitor limits: Horizontal frequency range.......30-80 kHz Vertical frequency range.........50-75 Hz Maximum bandwidth range..........230 MHz GTF supported ----------------------------------------------------- ------------ EXTENSION EDID BLOCK 1 --------------- ----------------------------------------------------- CEA-EXT: CEA 861 Series Extension: ---------------------------------- Revision:...........................3 First DTD block at offset...........43 Display Supports: Underscan on PC modes Basic audio YCbCr 4:4:4 YCbCr 4:2:2 Data Block Collection #1 - Type 2 Video Type: standard CEA Timings 1): ( 1) 640 x 480p @ 59.94/60Hz - 4:3 - 'DMT0659' 2): ( 3) 720 x 480p @ 59.94/60Hz - 16:9 - '480pH' 3): ( 4) 1280 x 720p @ 59.94/60Hz - 16:9 - '720p' 4): ( 5) 1920 x 1080i @ 59.94/60Hz - 16:9 - '1080i' 5): ( 7) 720(1440) x 480i @ 59.94/60Hz - 16:9 - '480iH' 6): (16) 1920 x 1080p @ 59.94/60Hz - 16:9 - '1080p' (is native) 7): (18) 720 x 576p @ 50Hz - 16:9 - '576pH' 8): (19) 1280 x 720p @ 50Hz - 16:9 - '720p50' 9): (20) 1920 x 1080i @ 50Hz - 16:9 - '1080i25' 10): (22) 720(1440) x 576i @ 50Hz - 16:9 - '576iH' 11): (31) 1920 x 1080p @ 50Hz - 16:9 - '1080p50' (is native) 12): (32) 1920 x 1080p @ 23.98/24Hz - 16:9 - '1080p24' 13): (34) 1920 x 1080p @ 29.97/30Hz - 16:9 - '1080p30' Data Block Collection #2 - Type 1 Audio Type Block Supported format: Linear Pulse Code Modulation (LPƒ), on 2 channels Supported freq: 32kHz, 44.1kHz, 48kHz Supported samples: 16 bit, 20 bit, 24 bit Supported format: AC3, on 2 channels Supported freq: 32kHz, 44.1kHz, 48kHz, 96kHz Maximum bitrate: 640kHz Data Block Collection #3 - Type 4 Speaker allocation data block Front Left / Front Right Front Left High / Front Right High Data Block Collection #4 - Type 3 Vendor specific Identifier Found HDMI IEEE Registration Identifier CEC physical address........... 1.0.0.0 Supports AI (ACP, ISRC)........ Yes Supports 48bpp color depth..... No Supports 36bpp color depth..... Yes Supports 30bpp color depth..... Yes Supports YCbCr 4:4:4........... Yes Supports dual-link DVI......... No Maximum TMDS clock............. 300 MHz HDMI video capabilities........ Yes Supports 3D.................... No HDMI 1.4a specifics............ present Data Block Collection #5 - Type 7 Reserved for video-related blocks Detailed Timing Blocks - 2 are native Detailed Timing Block #1 - Timing definition: Mode = 720 x 480 @ 59.940Hz Pixel Clock............. 27.00 MHz Non-Interlaced Horizontal Vertical Active.................. 720 pixels 480 lines Front Porch............. 16 pixels 9 lines Sync Width.............. 62 pixels 6 lines Back Porch.............. 60 pixels 30 lines Blanking................ 138 pixels 45 lines Total................... 858 pixels 525 lines Scan Rate............... 31.469 kHz 59.940 Hz Image Size.............. 708 mm 398 mm Border.................. 0 pixels 0 lines Sync: Digital separate with * Negative vertical polarity * Negative horizontal polarity Detailed Timing Block #2 - Timing definition: Mode = 720 x 576 @ 50.000Hz Pixel Clock............. 27.00 MHz Non-Interlaced Horizontal Vertical Active.................. 720 pixels 576 lines Front Porch............. 12 pixels 5 lines Sync Width.............. 64 pixels 5 lines Back Porch.............. 68 pixels 39 lines Blanking................ 144 pixels 49 lines Total................... 864 pixels 625 lines Scan Rate............... 31.250 kHz 50.000 Hz Image Size.............. 708 mm 398 mm Border.................. 0 pixels 0 lines Sync: Digital separate with * Negative vertical polarity * Negative horizontal polarity Detailed Timing Block #3 - Timing definition: Mode = 1280 x 720 @ 50.000Hz Pixel Clock............. 74.25 MHz Non-Interlaced Horizontal Vertical Active.................. 1280 pixels 720 lines Front Porch............. 440 pixels 5 lines Sync Width.............. 40 pixels 5 lines Back Porch.............. 220 pixels 20 lines Blanking................ 700 pixels 30 lines Total................... 1980 pixels 750 lines Scan Rate............... 37.500 kHz 50.000 Hz Image Size.............. 708 mm 398 mm Border.................. 0 pixels 0 lines Sync: Digital separate with * Positive vertical polarity * Positive horizontal polarity ----------------------------------------------------- ------------ EXTENSION EDID BLOCK 2 --------------- ----------------------------------------------------- DID-EXT: Display ID Extension: ------------------------------ (only partly interpreted) DisplayID version........1.1 DisplayID Block Type = Detailed Timing Block type 1: Detailed Timing #1 in Block Mode = 3840 x 2160 @ 60.000Hz Pixel Clock............. 594.00 MHz Non-Interlaced Horizontal Vertical Active.................. 3840 pixels 2160 lines Front Porch............. 176 pixels 8 lines Sync Width.............. 88 pixels 10 lines Back Porch.............. 296 pixels 72 lines Blanking................ 560 pixels 90 lines Total................... 4400 pixels 2250 lines Scan Rate............... 135.000 kHz 60.000 Hz Is non-default Mode Sync: Digital separate with * Positive vertical polarity * Positive horizontal polarity DisplayID Block Type = ASCII String: SwitchResX ``` May be with this information somebody can help me to fix the problem. Regards, Dmitry ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 2, 2017, 11:17am UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/3 "2017-08-02T11:17:17Z")
Insert into the sreen section of your xorg.conf ```auto Option "ModeDebug" "true" ``` restart, then run nvidia-bug-report.sh and attach output file. If you don’t have a xorg.conf, create one using nvidia-xconfig --mode-debug ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 2, 2017, 12:09pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/4 "2017-08-02T12:09:02Z")
> [@](#): > > Insert into the sreen section of your xorg.conf > > ```auto > Option "ModeDebug" "true" > > ``` > > restart, then run nvidia-bug-report.sh and attach output file. > If you don’t have a xorg.conf, create one using nvidia-xconfig --mode-debug Hi, here it is [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/1RR1fStVvEUunwvnpvkB1Wv8WLl.gz) (248 KB) ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 2, 2017, 5:42pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/5 "2017-08-02T17:42:51Z")
The timings seem to be the same as in switchresx. Does the 50Hz mode work? ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 2, 2017, 7:16pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/6 "2017-08-02T19:16:03Z")
> [@](#): > > The timings seem to be the same as in switchresx. Does the 50Hz mode work? No, the same flickering as at 60Hz ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 2, 2017, 8:40pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/7 "2017-08-02T20:40:02Z")
Two things I noticed: at 50/60Hz, your display only supports YUV 420, is this correct? Most notable oddity: the driver sets a viewport of 1920x2160 for 50/60Hz modes. Looks like a driver bug. Did you try earlier drivers? ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 2, 2017, 9:01pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/8 "2017-08-02T21:01:00Z")
Some research done, the Seiki has only one hdmi 2.0 port and two 1.4 ports. From the logs you provided you’re connected to a 1.4 one. Find the 2.0 port. ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 2, 2017, 10:19pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/9 "2017-08-02T22:19:12Z")
> [@](#): > > Two things I noticed: > at 50/60Hz, your display only supports YUV 420, is this correct? > Most notable oddity: the driver sets a viewport of 1920x2160 for 50/60Hz modes. Looks like a driver bug. Did you try earlier drivers? Yes, I tried earlier drivers too. The same result. As for YUV 420 I’m not sure, but under macos it looks like it uses full color space. See attached system info screen ![Screen Shot 2017-08-03 at 01.09.18.png](https://global.discourse-cdn.com/nvidia/original/3X/0/8/08d284975d2f33414a1ba66c25d511a1140ea4cd.png) ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 2, 2017, 10:21pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/10 "2017-08-02T22:21:16Z")
> [@](#): > > Some research done, the Seiki has only one hdmi 2.0 port and two 1.4 ports. From the logs you provided you’re connected to a 1.4 one. Find the 2.0 port. I’m using hdmi 1 port, the one that supports hdmi 2.0 for sure. Both windows and os x can run using this connection at 4k@60hz, which is only possible over hdmi 2.0 ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 3, 2017, 7:45am UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/11 "2017-08-03T07:45:15Z")
Actually, a subsampling of 420 makes it possible to run 4k@60 over a hdmi 1.4 (speed) link. Switchresx also talks of 300MHz TMDS clock instead of 600MHz. But it only mentions supported subsampling of 444 and 422. The display is putting out some really contradictory values. But that shouldn’t lead the driver to set up this weird viewport, which is probably the reason for the strange output you’re seeing. Don’t know if there would be a temporary workaround using some ‘Option ModeValidation’ tweaks to set up an own modeline. Other than that, did you look for a firmware update for your tv? ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 3, 2017, 1:43pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/12 "2017-08-03T13:43:35Z")
> [@](#): > > Actually, a subsampling of 420 makes it possible to run 4k@60 over a hdmi 1.4 (speed) link. > Switchresx also talks of 300MHz TMDS clock instead of 600MHz. But it only mentions supported subsampling of 444 and 422. The display is putting out some really contradictory values. > But that shouldn’t lead the driver to set up this weird viewport, which is probably the reason for the strange output you’re seeing. Don’t know if there would be a temporary workaround using some ‘Option ModeValidation’ tweaks to set up an own modeline. > Other than that, did you look for a firmware update for your tv? I have the latest firmware I’ve found in the internet: ATSC\_SY15335\_SEIKI\_V42DK1-QS1\_4k2k\_CV3393CH\_V\_11\_B1716\_20150814. Though it’s 2 years old, I can’t find any newer. If there is no other workaround, I can try to setup a new mode to try it on, if you can guide me on how to do this right way. Thank you, Dmitry ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 3, 2017, 2:43pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/13 "2017-08-03T14:43:40Z")
I doubt this will work, but worth a try: In the screen section, add ```auto Option "DP-0: ModeValidation" "NoVertRefreshCheck; NoHorizSyncCheck; NoVesaModes; NoEdidModes; NoXServerModes; NoPredefinedModes; AllowNonEdidModes;" Option "IncludeImplicitMetaModes" "false" SubSection "Display" Modes "3840x2160x30" "3840x2160x60" EndSubSection ``` and to the monitor section ```auto Modeline "3840x2160x30" 593.41 3840 4016 4104 4400 2160 2168 2178 2250 +HSync +Vsync Modeline "3840x2160x60" 297 3840 4016 4104 4400 2160 2168 2178 2250 +HSync +Vsync ``` and see what happens. ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 3, 2017, 3:29pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/14 "2017-08-03T15:29:39Z")
> [@](#): > > I doubt this will work, but worth a try: > In the screen section, add > > ```auto > Option "DP-0: ModeValidation" "NoVertRefreshCheck; NoHorizSyncCheck; NoVesaModes; NoEdidModes; NoXServerModes; NoPredefinedModes; AllowNonEdidModes;" > Option "IncludeImplicitMetaModes" "false" > SubSection "Display" > Modes "3840x2160x30" "3840x2160x60" > EndSubSection > > ``` > > and to the monitor section > > ```auto > Modeline "3840x2160x30" 593.41 3840 4016 4104 4400 2160 2168 2178 2250 +HSync +Vsync > Modeline "3840x2160x60" 297 3840 4016 4104 4400 2160 2168 2178 2250 +HSync +Vsync > > ``` > > and see what happens. Hi, I tried this and there are no visible changes. I attached my xorg.conf and nvidia-bug-report.log May be you can find there something… [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/lnodXaRlXyl4Yhd1MdNskOZTk9R.gz) (335 KB) [xorg.conf.tar.gz](https://forums.developer.nvidia.com/uploads/short-url/gDT05h1Gi8TneznZblcEsLN66Ml.gz) (966 Bytes) ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 3, 2017, 3:48pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/15 "2017-08-03T15:48:39Z")
Sorry, typo. instead of Option “DP-0: ModeValidation” "NoVertRefre… it should be Option “ModeValidation” "DP-0: NoVertRefre… ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 3, 2017, 4:09pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/16 "2017-08-03T16:09:10Z")
> [@](#): > > Sorry, typo. > instead of > Option “DP-0: ModeValidation” "NoVertRefre… > it should be > Option “ModeValidation” "DP-0: NoVertRefre… The same result. Nothing’s changed. Please, find attached new xorg.conf and nvidia-bug-report.log [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/q2oqxltGzsVkQ93dnr47xyA7lWE.gz) (251 KB) [xorg.conf.tar.gz](https://forums.developer.nvidia.com/uploads/short-url/jaf3COlGDQm83YagcFFgbeL2ror.gz) (964 Bytes) ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 3, 2017, 4:26pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/17 "2017-08-03T16:26:34Z")
Aaaargh, this should be the correct line: ```auto Option "ModeValidation" "DP-0: NoVertRefreshCheck, NoHorizSyncCheck, NoVesaModes, NoEdidModes, NoXServerModes, NoPredefinedModes, AllowNonEdidModes;" ``` “a semicolon-separated list of comma-separated lists of mode validation arguments…prepended by colon-separated display identifier” Edit: and again forgot to remove the DP-0: at the beginning. ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 3, 2017, 7:01pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/18 "2017-08-03T19:01:57Z")
> [@](#): > > Aaaargh, this should be the correct line: > > ```auto > Option "ModeValidation" "DP-0: NoVertRefreshCheck, NoHorizSyncCheck, NoVesaModes, NoEdidModes, NoXServerModes, NoPredefinedModes, AllowNonEdidModes;" > > ``` > > “a semicolon-separated list of comma-separated lists of mode validation arguments…prepended by colon-separated display identifier” > Edit: and again forgot to remove the DP-0: at the beginning. With this settings the system doesn’t boot at all. I have to reset graphics to default to let it boot. The log and config are attached. [xorg.conf.tar.gz](https://forums.developer.nvidia.com/uploads/short-url/aVxIwzpMi4vis1eP6iN9Rq0AZla.gz) (967 Bytes) [Xorg.0.log.old.tar.gz](https://forums.developer.nvidia.com/uploads/short-url/g6tSQvXx9iIadqa8E3xoeRzPXIA.gz) (15.9 KB) ---
**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\ **Post date:** [August 3, 2017, 7:22pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/19 "2017-08-03T19:22:52Z")
Yeah, forgot about this bug: [url][https://devtalk.nvidia.com/default/topic/898310/linux/352-63-regression-quot-noedidmodes-quot-breaks-custom-quot-modeline-quot-modes-ubuntu-14-04-/2[/url]](https://devtalk.nvidia.com/default/topic/898310/linux/352-63-regression-quot-noedidmodes-quot-breaks-custom-quot-modeline-quot-modes-ubuntu-14-04-/2%5B/url%5D) Wrong mode due to bug, workaround not possible due to other bug. Just delete the Option ModeValidation line. I think the custom modelines will be filtered out. ---
**Author:** ![rdmitry](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@rdmitry](https://forums.developer.nvidia.com/u/rdmitry)\ **Post date:** [August 3, 2017, 7:47pm UTC](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162/20 "2017-08-03T19:47:11Z")
> [@](#): > > Yeah, forgot about this bug: > [https://devtalk.nvidia.com/default/topic/898310/linux/352-63-regression-quot-noedidmodes-quot-breaks-custom-quot-modeline-quot-modes-ubuntu-14-04-/2](https://devtalk.nvidia.com/default/topic/898310/linux/352-63-regression-quot-noedidmodes-quot-breaks-custom-quot-modeline-quot-modes-ubuntu-14-04-/2) > Wrong mode due to bug, workaround not possible due to other bug. > Just delete the Option ModeValidation line. I think the custom modelines will be filtered out. Does that mean, that there is no workaround possible at the moment? [Next page](https://forums.developer.nvidia.com/t/screen-flickering-at-4k-60hz/52162.md?page=2)