xrandr: Failed to get size of gamma for output default
Screen 0: minimum 320 x 240, current 1366 x 768, maximum 1680 x 1200
default connected 1366x768+0+0 0mm x 0mm
1600x1200 60.0
1680x1050 60.0
1400x1050 75.0 70.0 60.0
1280x1024 75.0 60.0
1440x900 60.0
1280x960 60.0
1366x768 60.0*
1360x768 60.0
1152x864 75.0 70.0 60.0
1280x720 60.0
1024x768 75.0 60.0 70.0
832x624 75.0
800x600 75.0 60.0 72.0 65.0 56.0
840x525 75.0 70.0 60.0
700x525 75.0 70.0 60.0
640x512 75.0 60.0
720x450 60.0
640x480 75.0 60.0 73.0
720x400 70.0
680x384 60.0
576x432 75.0 70.0 60.0
512x384 75.0 70.0 60.0
416x312 75.0
400x300 75.0 72.0 60.0 56.0
320x240 75.0 73.0 60.0
1680x1200 60.0
sudo xrandr --output CRT1 --mode 1366x768 --rate 60
xrandr: Failed to get size of gamma for output default
warning: output CRT1 not found; ignoring