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HDMI can't get modes for 1280x800 resolution from EDID



Have an OPi 4B with installed Armbian (Armbian_21.05.1_Orangepi4_buster_legacy_4.4.213_xfce_desktop.img from here) which is working perfectly. HUGE thanks for that.

So i wanted to try images with mainline kernel and found that none of XFCE desktop images from the archive can correctly output HDMI signal for my screen, maximum i could achive was compressed and flickering image using method from docs (editing /etc/X11/xorg.conf.d/40-monitor.conf). 

by default there are no modes in /sys/class/drm/card0-HDMI-A-1/modes in mainline images and in legacy one there are two: 1280x800p60 and 1280x800p57.

EDID is there in both images.

And if i set resolution via /etc/X11/xorg.conf.d/40-monitor.conf in mainline i can't change it to anything via xrandr because "Configure crtc 0 failed".


on the latest mainline image (Armbian_22.08.10_Orangepi4_jammy_current_5.15.76_xfce_desktop.img) i was able to get normal resolution doing the following :

1. edit /etc/X11/xorg.conf.d/40-monitor.conf   from console like below:

Section "Monitor"

Identifier "HDMI-1"

Modeline "1280x800_try4" 75 1280 1290 1300 1500 800 805 810 823 +hsync -vsync

Option "PreferredMode" "1280x800_try4"



this gets me a compressed screen after reboot.

2. then in terminal:

xrandr --newmode "1280x800_60.00" 83.46 1280 1344 1480 1680 800 801 804 828 -hsync +vsync

xrandr --addmode DP-1 1280x800_60.00

xrandr --output DP-1 --mode 1280x800_60.00

xrandr --output DP-1 --crtc 1


after that image on HDMI suddenly becomes normal but still no resolution changes can be applied to HDMI


Any chances for easy workaround here?

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