# 4K resolution don't appear in Modeline for Xorg server **URL:** \ **Category:** Linux\ **Created:** [April 12, 2024, 2:35pm UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446 "2024-04-12T14:35:11Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![julien.lamome](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@julien.lamome](https://forums.developer.nvidia.com/u/julien.lamome)\ **Post date:** [April 12, 2024, 2:35pm UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/1 "2024-04-12T14:35:11Z")
I have an Intel Xeon with Quadro M4000. OS : Debian Bookworm (12). 2 screen connected on this card: A standard Monitor (1600px) and a Sony TV 4K . This configuration worked well with driver “nouveau”, TV display a 4K picture 3840x2160@24. I need to encode video in Realtime. I failed to use hardware accel with “nouveau”. So I installed nvidia driver. With Nvidia Driver, TV displays 1920x1080 pictures, not more. I activated ModeDebug in xorg.conf, and I think problem come from this section (extract from Xorg.log) : ```auto [79305.276] (II) NVIDIA(GPU-0): --- Building ModePool for SONY TV *02 (DFP-1) --- ... [79305.277] (WW) NVIDIA(GPU-0): Validating Mode "3840x2160_24": [79305.277] (WW) NVIDIA(GPU-0): Mode Source: EDID [79305.277] (WW) NVIDIA(GPU-0): 3840 x 2160 @ 24 Hz [79305.277] (WW) NVIDIA(GPU-0): Pixel Clock : 296.70 MHz [79305.277] (WW) NVIDIA(GPU-0): HRes, HSyncStart : 3840, 5116 [79305.277] (WW) NVIDIA(GPU-0): HSyncEnd, HTotal : 5204, 5500 [79305.277] (WW) NVIDIA(GPU-0): VRes, VSyncStart : 2160, 2168 [79305.277] (WW) NVIDIA(GPU-0): VSyncEnd, VTotal : 2178, 2250 [79305.277] (WW) NVIDIA(GPU-0): Sync Polarity : +H +V [79305.277] (WW) NVIDIA(GPU-0): Mode is rejected: PixelClock ( **296.7** MHz) too high for [79305.277] (WW) NVIDIA(GPU-0): Display Device ( **Max: 165.0 MHz** ). [79305.277] (WW) NVIDIA(GPU-0): GPU extended capability check failed. [79305.277] (WW) NVIDIA(GPU-0): Mode "3840x2160_24" is invalid. ``` Because all working well with “nouveau”, I think this is a problem with Nvidia configuration. Thank you for help. [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/apLGWRhlkE4dKXZoLjmlG7Hu4uf.gz) (622.2 KB) ---
**Author:** ![aplattner](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/aplattner/32/14043_2.png) [@aplattner](https://forums.developer.nvidia.com/u/aplattner)\ **Post date:** [April 12, 2024, 6:01pm UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/2 "2024-04-12T18:01:11Z")
DFP-1 in your configuration is a single-link TMDS connection with a maximum pixel clock of 165 MHz. If your monitor requires a higher pixel clock, you can try setting [Option “ModeDebug” “NoMaxPClkCheck”](https://people.freedesktop.org/~aplattner/nvidia-readme/xconfigoptions.html#ModeValidation) in /etc/X11/xorg.conf. ---
**Author:** ![julien.lamome](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@julien.lamome](https://forums.developer.nvidia.com/u/julien.lamome)\ **Post date:** [April 22, 2024, 11:44am UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/3 "2024-04-22T11:44:25Z")
Thank you for the answer. I tested your option. It doesn’t work. Joined, my Xorg config and the log. maybe : ```auto [934735.058] (WW) NVIDIA(GPU-0): Validating Mode "3840x2160_24": [934735.058] (WW) NVIDIA(GPU-0): Mode Source: EDID [934735.058] (WW) NVIDIA(GPU-0): 3840 x 2160 @ 24 Hz [934735.058] (WW) NVIDIA(GPU-0): Pixel Clock : 296.70 MHz [934735.058] (WW) NVIDIA(GPU-0): HRes, HSyncStart : 3840, 5116 [934735.058] (WW) NVIDIA(GPU-0): HSyncEnd, HTotal : 5204, 5500 [934735.058] (WW) NVIDIA(GPU-0): VRes, VSyncStart : 2160, 2168 [934735.058] (WW) NVIDIA(GPU-0): VSyncEnd, VTotal : 2178, 2250 [934735.058] (WW) NVIDIA(GPU-0): Sync Polarity : +H +V [934735.058] (WW) NVIDIA(GPU-0): The EDID for SONY TV *02 (DP-1) contradicts itself: mode [934735.058] (WW) NVIDIA(GPU-0): "3840x2160" is specified in the EDID; however, the EDID's [934735.058] (WW) NVIDIA(GPU-0): valid VertRefresh range (48.000-62.000 Hz) would exclude [934735.058] (WW) NVIDIA(GPU-0): this mode's VertRefresh (23.976 Hz); ignoring VertRefresh [934735.058] (WW) NVIDIA(GPU-0): check for mode "3840x2160". [934735.058] (WW) NVIDIA(GPU-0): Unable to determine HDMI 2.1 Fixed Rate Link [934735.058] (WW) NVIDIA(GPU-0): configuration. [934735.058] (WW) NVIDIA(GPU-0): Mode is rejected: Unable to construct hardware-specific [934735.058] (WW) NVIDIA(GPU-0): mode timings. [934735.058] (WW) NVIDIA(GPU-0): GPU extended capability check failed. [934735.058] (WW) NVIDIA(GPU-0): Mode "3840x2160_24" is invalid. ``` > DFP-1 in your configuration is a single-link TMDS connection with a maximum pixel clock of 165 MHz Ok, how can I change this ? [xorg.conf.txt](https://forums.developer.nvidia.com/uploads/short-url/6Nk2fOJC7iJsILhMRcgyWgikGyw.txt) (2.3 KB) [Xorg.1.log](https://forums.developer.nvidia.com/uploads/short-url/3G376FVeRiBjwTr5yMuA8bBml2Z.log) (322.0 KB) ---
**Author:** ![julien.lamome](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@julien.lamome](https://forums.developer.nvidia.com/u/julien.lamome)\ **Post date:** [April 23, 2024, 8:56am UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/4 "2024-04-23T08:56:36Z")
Option “ModeValidation” “NoMaxPClkCheck,NoVertRefreshCheck” doesn’t help. Why this installation work with nouveau driver not with Nvidia 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:** [April 23, 2024, 9:38am UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/5 "2024-04-23T09:38:14Z")
I’ve now seen this multiple times, especially on Quadros, that using passive DP2HDMI adapter cables only results in a hdmi 1.0 @165Hz TMDS and not the expected hdmi 1.3 @300MHz TMDS. @julien.lamome a workaround would be using an active DP2HDMI2.0 converter with support for 4k@60Hz ---
**Author:** ![julien.lamome](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@julien.lamome](https://forums.developer.nvidia.com/u/julien.lamome)\ **Post date:** [April 23, 2024, 11:51am UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/6 "2024-04-23T11:51:16Z")
Thank you generix for the tip. I use an DP to HDMI adapter. I will search active converter (24Hz, is suffisent). The mystery: why nouveau driver is ok ? ---
**Author:** ![julien.lamome](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@julien.lamome](https://forums.developer.nvidia.com/u/julien.lamome)\ **Post date:** [April 23, 2024, 2:12pm UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/7 "2024-04-23T14:12:32Z")
I found an other adapter in my pocket. Now I can select all modes supported by TV. ---
**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:** [April 23, 2024, 2:12pm UTC](https://forums.developer.nvidia.com/t/4k-resolution-dont-appear-in-modeline-for-xorg-server/289446/8 "2024-04-23T14:12:59Z")
IDK, different threshold for connection, driver bug?