I have three displays in my computer setup with two plugged with HDMI-cables and one with DisplayPort-cable. My problem is the following:
When I start my computer all the displays start and work correctly. If I lock my screen for a little while (say few minutes) and then open the lock all screen work fine. If however I lock my screens and go away for a longer time (say 15-30 mins) and then open screen lock, one display plugged with HDMI-cable does not start. Even if I try to adjust display settings nothing happens. My current fix is to restart the computer and then all the displays fire up correctly.
What could be the cause of this problem and how to fix this? I suspect it might have something to do with the system turning the screens off after few minutes. The problem is that when I try to activate the screens again one of them does not start anymore (HDMI-0).
In case you need it, here is the output of xrandr -q -command:
Screen 0: minimum 8 x 8, current 6200 x 1920, maximum 32767 x 32767 HDMI-0 connected primary 2560x1440+1080+480 (normal left inverted right x axis y axis) 608mm x 345mm 3840x2160 30.00 + 29.97 25.00 23.98 2560x1440 59.95* 1920x1080 60.00 59.94 50.00 29.97 23.97 1680x1050 59.95 1600x900 60.00 1440x900 59.89 1280x1024 75.02 60.02 1280x800 59.81 1280x720 60.00 59.94 50.00 1152x864 75.00 1024x768 75.03 70.07 60.00 800x600 75.00 72.19 60.32 56.25 720x576 50.00 720x480 59.94 640x480 75.00 72.81 59.94 HDMI-1 connected 1080x1920+0+0 left (normal left inverted right x axis y axis) 527mm x 296mm 1920x1080 60.00*+ 59.94 50.00 60.05 60.00 50.04 1600x900 60.00 1280x1024 75.02 60.02 1280x720 60.00 59.94 50.00 1152x864 75.00 1024x768 75.03 60.00 800x600 75.00 60.32 720x576 50.00 720x480 59.94 640x480 75.00 59.94 59.93 DP-0 connected 2560x1440+3640+480 (normal left inverted right x axis y axis) 607mm x 345mm 3840x2160 60.00 + 30.00 2560x1440 59.95* 1920x1080 60.00 59.94 1680x1050 59.95 1600x900 60.00 1440x900 59.89 1280x1024 75.02 60.02 1280x800 59.81 1280x720 60.00 1152x864 75.00 1024x768 75.03 70.07 60.00 800x600 75.00 72.19 60.32 56.25 640x480 75.00 72.81 59.94 DP-1 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) DP-3 disconnected (normal left inverted right x axis y axis) The problem display is the one with ‘HDMI-0’ label.
