Arch Linux

Scobrant

Member

Registered: 2024-01-18

Posts: 7

Display problems on Boot

Hello

There is a problem where I need to power on my monitor before powering on my computer. If I don't its either there will be no signal or maybe get signal that is 640x480. Reboot always worked for now but how do I make this automatically?

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 70,959

Re: Display problems on Boot

https://bbs.archlinux.org/viewtopic.php?id=309806

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Scobrant

Member

Registered: 2024-01-18

Posts: 7

Re: Display problems on Boot

Hello this doesn't seem to work. I sometimes get the low-res instead of no signal. Or maybe I did the arch.conf wrong? I added video:DP-1=2560x1440@170me

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 70,959

Re: Display problems on Boot

video=OUTPUT_NAME:resolution…
Is DP-1 even the correct output name and does the output run at 170Hz?? (166 is more common and usually just VRR)

for OUT in /sys/class/drm/card*; do echo $OUT; edid-decode $OUT/edid; echo "================="; done

You'll need https://archlinux.org/packages/extra/x86_64/v4l-utils/

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

Scobrant

Member

Registered: 2024-01-18

Posts: 7

Re: Display problems on Boot

Block 2, DisplayID Extension Block:
  Version: 1.2
  Extension Count: 0
  Display Product Type: Extension Section
  Video Timing Modes Type 1 - Detailed Timings Data Block:
    DTD:  2560x1440  170.001031 Hz  16:9    249.902 kHz    659.740000 MHz (aspect 16:9, no 3D stereo)
               Hfront   24 Hsync  32 Hback   24 Hpol N
               Vfront    3 Vsync   5 Vback   22 Vpol P
    DTD:  1920x1080   60.000000 Hz  16:9     67.500 kHz    148.500000 MHz (aspect 16:9, no 3D stereo)
               Hfront   48 Hsync  32 Hback  200 Hpol N
               Vfront    3 Vsync   5 Vback   37 Vpol N
  Supported Timing Modes Type 1 - VESA DMT Timings Data Block:
    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
    DMT 0x1c:  1280x800    59.810326 Hz  16:10    49.702 kHz     83.500000 MHz
    DMT 0x23:  1280x1024   60.019740 Hz   5:4     63.981 kHz    108.000000 MHz
    DMT 0x33:  1600x1200   60.000000 Hz   4:3     75.000 kHz    162.000000 MHz
    DMT 0x3a:  1680x1050   59.954250 Hz  16:10    65.290 kHz    146.250000 MHz
    DMT 0x45:  1920x1200   59.884600 Hz  16:10    74.556 kHz    193.250000 MHz
  Checksum: 0x66
Checksum: 0x90
=================
/sys/class/drm/card1-DP-2
EDID of '/sys/class/drm/card1-DP-2/edid' was empty.
=================
/sys/class/drm/card1-DP-3
EDID of '/sys/class/drm/card1-DP-3/edid' was empty.
=================
/sys/class/drm/card1-HDMI-A-1
EDID of '/sys/class/drm/card1-HDMI-A-1/edid' was empty.
=================
[scob@archlinux ~]$ 

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 70,959

Re: Display problems on Boot

There's a 2560x1440@170 mode in the second DTD, but the head of the output is completely missing (incl. which output this actually is)
In doubt the syntax (color and equation) is wrong and in general I'd suggest to rather inject the edid.

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc