I use Ubuntu 18.04 (recently installed) with 3 displays. One of them keeps turning off and on from time to time.
- restarting the system sometimes fixes the issue
- opening the system settings sometimes fixes the issue, some other time causes the issue
I'm 100% sure it's not a display issue because I tried to replace the display and the problem is still there, so I'm sure it's something about the software and not the hardware.
EDIT:
- apparently also unplugging and plugging the display again sometimes solves the issue
- typing
xrandr
also sometimes solves the issue - the combination of the last two usually solves the issue, but only if I keep the settings closed