Per this thread:
http://forum.lemaker.org/thread-1577-1-1.html
Disable EDID (auto detection. Be aware this disables autodetection (duh)):
mount /dev/mmcblk0p1 /mnt/
pico /mnt/uEnv.txt
Look for:
disp.screen0_output_mode=EDID:1280x1024p60
Remove "EDID," optionally specify the resolution you want
Related:
xrandr --output CRT0 --brightness 0.7 --crtc CRT0 --gamma 1:1:1 --newmode "800x600_60.00" 38.25 800 832 912 1024 600 603 607 624 -hsync +vsync
