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/c
so, in case someone needs this too:
General guide to succesfuly use not so popular screen resolutions.
0) Make sure your monitor works with another PCs, and, maybe, with other distros
1) Get your monitor EDID any convinient way - through console ( cat /sys/class/drm/cardX-HDMI-A-Y/edid X and Y are numbers depending on your setup) or another PC and check if it is OK.
2) Check what clock frequency is used in your EDID, (e.g. min was 71.33 MHz) and pick the closet in from given
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