A few more words might be in order:
/sys/class/drm/card0-Unknown-1/edid
does not contain any edid data$ export EDID=`cat /sys/class/drm/card0-Unknown-1/edid`
$ echo a-${EDID}-b
a--b
- But under X11,
xrandr --props
shows them (see below).
- Also
nvidia-settings
is able to retrieve edid data. In addition, it reports ‘GPU 0 - (NVIDIA GeForce RTX 2060)’ to be connected to ‘DP-0 - (LG Electronics LG HDR 4K)’.
- Adding something like
vidio=0-Unknown-1:3840x2160@60
to grub in the lines of Add custom resolution and refresh rate when using Wayland is possible. However, it will work for resolutions up to 1920x1080 only, but not for HiDPI (3840x2160) which I require.
- Providing an edid file on boot in the lines of Custom mode lines in Wayland - Ricky's Hodgepodge seem to have no effect at all.
Edid details
$ cat /sys/class/drm/card0-Unknown-1/edid | edid-decode
EDID of 'stdin' was empty.
But xrandr
has edid info
$ xrandr --props | edid-decode
edid-decode (hex):
00 ff ff ff ff ff ff 00 1e 6d 07 77 2d a5 02 00
05 1d 01 04 b5 3c 22 78 9e 3e 31 ae 50 47 ac 27
0c 50 54 21 08 00 71 40 81 80 81 c0 a9 c0 d1 c0
81 00 01 01 01 01 4d d0 00 a0 f0 70 3e 80 30 20
65 0c 58 54 21 00 00 1a 28 68 00 a0 f0 70 3e 80
08 90 65 0c 58 54 21 00 00 1a 00 00 00 fd 00 38
3d 1e 87 38 00 0a 20 20 20 20 20 20 00 00 00 fc
00 4c 47 20 48 44 52 20 34 4b 0a 20 20 20 01 96
02 03 19 71 44 90 04 03 01 23 09 07 07 83 01 00
00 e3 05 c0 00 e3 06 05 01 02 3a 80 18 71 38 2d
40 58 2c 45 00 58 54 21 00 00 1e 56 5e 00 a0 a0
a0 29 50 30 20 35 00 58 54 21 00 00 1a 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 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 00 00 00 00 00 00 00 00 00 00 00 00 00 00 29
----------------
Block 0, Base EDID:
EDID Structure Version & Revision: 1.4
Vendor & Product Identification:
Manufacturer: GSM
Model: 30471
Serial Number: 173357
Made in: week 5 of 2019
Basic Display Parameters & Features:
Digital display
Bits per primary color channel: 10
DisplayPort interface
Maximum image size: 60 cm x 34 cm
Gamma: 2.20
DPMS levels: Standby
Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2
Default (sRGB) color space is primary color space
First detailed timing includes the native pixel format and preferred refresh rate
Color Characteristics:
Red : 0.6796, 0.3154
Green: 0.2802, 0.6738
Blue : 0.1523, 0.0498
White: 0.3125, 0.3291
Established Timings I & II:
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
Standard Timings:
GTF : 1152x864 60.000000 Hz 4:3 53.700 kHz 81.624000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
DMT 0x55: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
DMT 0x53: 1600x900 60.000000 Hz 16:9 60.000 kHz 108.000000 MHz (RB)
DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
DMT 0x1c: 1280x800 59.810326 Hz 16:10 49.702 kHz 83.500000 MHz
Detailed Timing Descriptors:
DTD 1: 3840x2160 59.996625 Hz 16:9 133.312 kHz 533.250000 MHz (600 mm x 340 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 54 Vsync 5 Vback 3 Vpol N
DTD 2: 3840x2160 30.000000 Hz 16:9 66.660 kHz 266.640000 MHz (600 mm x 340 mm)
Hfront 8 Hsync 144 Hback 8 Hpol P
Vfront 54 Vsync 5 Vback 3 Vpol N
Display Range Limits:
Monitor ranges (GTF): 56-61 Hz V, 30-135 kHz H, max dotclock 560 MHz
Display Product Name: 'LG HDR 4K'
Extension blocks: 1
Checksum: 0x96
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 1
Video Data Block:
VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (native)
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
Audio Data Block:
Linear PCM:
Max channels: 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
Colorimetry Data Block:
BT2020YCC
BT2020RGB
HDR Static Metadata Data Block:
Electro optical transfer functions:
Traditional gamma - SDR luminance range
SMPTE ST2084
Supported static metadata descriptors:
Static metadata type 1
Detailed Timing Descriptors:
DTD 3: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (600 mm x 340 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
DTD 4: 2560x1440 59.950550 Hz 16:9 88.787 kHz 241.500000 MHz (600 mm x 340 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N
Checksum: 0x29 Unused space in Extension Block: 66 bytes
Monitor controls are found as well:
$ ddccontrol -p
ddccontrol version 0.5.1
Copyright 2004-2005 Oleg I. Vdovikin (oleg@cs.msu.su)
Copyright 2004-2006 Nicolas Boichat (nicolas@boichat.ch)
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General Public License.
Detected monitors :
- Device: dev:/dev/i2c-3
DDC/CI supported: Yes
Monitor Name: LG GSM770 Display Port
Input type: Digital
(Automatically selected)
Reading EDID and initializing DDC/CI at bus dev:/dev/i2c-3...
EDID readings:
Plug and Play ID: GSM7707 [LG GSM770 Display Port]
Input type: Analog
= LG GSM770 Display Port
> Color settings
> Brightness and Contrast
> id=brightness, name=Brightness, address=0x10, delay=-1ms, type=0
supported, value=21, maximum=100
> id=contrast, name=Contrast, address=0x12, delay=-1ms, type=0
supported, value=50, maximum=100
> id=sharpness, name=Sharpness, address=0x87, delay=-1ms, type=0
supported, value=50, maximum=100
> LG Picture
> id=lgmode, name=Picture Mode, address=0x15, delay=-1ms, type=2
Possible values:
> id=reader - name=Reader, value=1
> id=custom - name=Custom, value=11
> id=srgb - name=sRGB, value=15
> id=fps - name=FPS, value=30
> id=rts - name=RTS, value=31
> id=hdreffect - name=HDR Effect, value=39
> id=cinema - name=Cinema, value=48
> id=vivid - name=Vivid, value=49
> id=dcip3 - name=DCI-P3, value=25
> id=ebu - name=EBU, value=22
> id=rec709 - name=REC709, value=23
supported, value=11, maximum=255
> Gamma
> id=gammamode, name=Gamma, address=0xfe, delay=-1ms, type=2
Possible values:
> id=mode1 - name=Mode 1, value=2
> id=mode2 - name=Mode 2, value=3
> id=mode3 - name=Mode 3, value=4
> id=mode4 - name=Mode 4, value=16
supported, value=3, maximum=255
> Color maximum level
> id=red, name=Red maximum level, address=0x16, delay=-1ms, type=0
supported, value=62, maximum=100
> id=green, name=Green maximum level, address=0x18, delay=-1ms, type=0
supported, value=50, maximum=100
> id=blue, name=Blue maximum level, address=0x1a, delay=-1ms, type=0
supported, value=45, maximum=100
> Various color settings
> id=colorpreset, name=Color Preset, address=0x14, delay=-1ms, type=2
Possible values:
> id=6500k - name=6500K, value=5
> id=9300k - name=9300K, value=8
> id=user - name=User, value=11
supported, value=11, maximum=11
> Position and size
> Automatic adjustments
> id=ratio, name=Aspect Ratio, address=0xf5, delay=-1ms, type=2
Possible values:
> id=1to1 - name=1:1, value=0
> id=wide - name=Full Wide, value=1
> id=original - name=Original, value=2
supported, value=1, maximum=255
> Others
> Restore defaults
> id=defaults, name=Restore Factory Defaults, address=0x4, delay=2000ms, type=1
Possible values:
> id=default - name=Restore Factory Defaults, value=1
supported, value=0, maximum=255
> id=defaultluma, name=Restore Brightness and Contrast, address=0x5, delay=2000ms, type=1
Possible values:
> id=default - name=Restore Brightness and Contrast, value=1
supported, value=0, maximum=1
> id=defaultcolor, name=Restore Factory Default Color, address=0x8, delay=2000ms, type=1
Possible values:
> id=default - name=Restore Factory Default Color, value=1
supported, value=0, maximum=255
> Audio
> id=audiospeakervolume, name=Audio Speaker Volume Adjust, address=0x62, delay=-1ms, type=0
supported, value=30, maximum=100
> id=audiospeakermute, name=Audio Speaker Mute, address=0x8d, delay=-1ms, type=2
Possible values:
> id=mute - name=Mute, value=1
> id=unmute - name=Unmute, value=2
supported, value=2, maximum=100
> OSD
> id=language, name=Language, address=0xcc, delay=-1ms, type=2
Possible values:
> id=english - name=English, value=0
> id=french - name=Français (French), value=2
> id=finnish - name=Suomi (Finnish), value=6
> id=german - name=Deutsch (German), value=1
> id=italian - name=Italiano (Italian), value=4
> id=korean - name=한국어 (Korean), value=16
> id=spanish - name=Castellano (Spanish), value=3
> id=russian - name=Русский (Russian), value=10
> id=swedish - name=Svenska (Swedish), value=5
> id=chinese_tw - name=繁體中文 (Traditional Chinese), value=14
> id=chinese - name=简体中文 (Simplified Chinese), value=13
> id=japanese - name=日本語 (Japanese), value=15
> id=polish - name=Polski (Polish), value=9
> id=czech - name=Český (Czech), value=11
> id=portuguese - name=Português (Portuguese), value=7
> id=finnish - name=Suomalainen (Finnish), value=6
> id=brazilian - name=Português do Brasil (Brazilian Portuguese), value=8
> id=ukrainian - name=українська (Ukrainian), value=12
supported, value=0, maximum=255
> id=osdlock, name=OSD Lock, address=0xeb, delay=-1ms, type=2
Possible values:
> id=off - name=Off, value=0
> id=on - name=On, value=1
supported, value=0, maximum=1
> Power control
> id=power, name=Power control, address=0xd6, delay=-1ms, type=2
Possible values:
> id=off - name=Off, value=5
> id=on - name=On, value=1
supported, value=1, maximum=5
> id=energysaving, name=Smart Energy Saving, address=0xf6, delay=-1ms, type=2
Possible values:
> id=off - name=Off, value=0
> id=low - name=Low, value=1
> id=high - name=High, value=2
supported, value=2, maximum=255
> Game Adjust
> id=freesync, name=FreeSync, address=0xf8, delay=-1ms, type=2
Possible values:
> id=off - name=Off, value=0
> id=base - name=Base, value=2
> id=extended - name=Extended, value=3
supported, value=0, maximum=255
> id=responsetime, name=Response Time, address=0xf7, delay=-1ms, type=2
Possible values:
> id=off - name=Off, value=0
> id=high - name=High, value=1
> id=middle - name=Middle, value=2
> id=low - name=Low, value=3
supported, value=2, maximum=255
$ cat lg.bin | monitor-parse-edid
Name: LG HDR 4K
EISA ID: GSM7707
EDID version: 1.4
EDID extension blocks: 1
Screen size: 60.0 cm x 34.0 cm (27.15 inches, aspect ratio 16/9 = 1.76)
Gamma: 2.2
Digital signal
Max video bandwidth: 560 MHz
HorizSync 30-135
VertRefresh 56-61
# Monitor preferred modeline (60.0 Hz vsync, 133.3 kHz hsync, ratio 16/9, 162 dpi)
ModeLine "3840x2160" 533.25 3840 3888 3920 4000 2160 2214 2219 2222 -hsync +vsync
# Monitor supported modeline (30.0 Hz vsync, 66.7 kHz hsync, ratio 16/9, 162 dpi)
ModeLine "3840x2160" 266.64 3840 3848 3992 4000 2160 2214 2219 2222 -hsync +vsync
# Monitor supported CEA modeline (60.0 Hz vsync, 67.5 kHz hsync, ratio 16/9, 81 dpi)
ModeLine "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
# Monitor supported CEA modeline (60.0 Hz vsync, 45.0 kHz hsync, ratio 16/9, 54 dpi)
ModeLine "1280x720" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
# Monitor supported CEA modeline (59.9 Hz vsync, 31.5 kHz hsync, ratio 3/2, 30x35 dpi) (bad ratio)
ModeLine "720x480" 27 720 736 798 858 480 489 495 525 -hsync -vsync
# Monitor supported CEA modeline (59.9 Hz vsync, 31.5 kHz hsync, ratio 4/3, 27x35 dpi) (bad ratio)
ModeLine "640x480" 25.175 640 656 752 800 480 490 492 525 -hsync -vsync
# Monitor supported modeline (60.0 Hz vsync, 67.5 kHz hsync, ratio 16/9, 81 dpi)
ModeLine "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
# Monitor supported modeline (60.0 Hz vsync, 88.8 kHz hsync, ratio 16/9, 108 dpi)
ModeLine "2560x1440" 241.5 2560 2608 2640 2720 1440 1443 1448 1481 -hsync +vsync