Comment 9 for bug 1892296

No, that doesn't help - the screen stays blank if I set it to 1920x1080 using g-c-c and then run the set max bpc command.

I also tried setting 1920x1080i using xrandr in case that's what g-c-c was choosing but it worked fine.

With the 1920x1080 setting chosen in g-c-c (and the monitor consequently getting no signal), this is what xrandr says for HDMI-1:

HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440 59.95 +
   1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98*
   1920x1080i 60.00 50.00 59.94
   1600x1200 60.00
   1280x1024 75.02 60.02
   1280x960 60.00
   1360x768 60.02
   1280x720 60.00 50.00 59.94
   1024x768 75.03 70.07 60.00
   800x600 75.00 60.32
   720x576 50.00
   720x576i 50.00
   720x480 60.00 59.94
   720x480i 60.00 59.94
   640x480 75.00 60.00 59.94
   720x400 70.08

ie it looks like g-c-c has chosen a mode that doesn't actually exist for xrandr, because none of the modes have an asterisk next to them.

Fwiw, I *think* that g-c-c did use to be able to successfully set the resolution to 1920x1080 on this monitor.