The DPI of my primary monitor is unreasonably large, so at boot I run xrandr --output eDP1 --scale 0.75x0.75. This is done automatically due to a ~/.config/autostart/xrandr.desktop file that I have containing this command on my Xubuntu 20.04 machine. However, only if my secondary monitor is plugged in, this blacks out the screen on my primary monitor, such that I can only see the mouse. This also makes the secondary monitor a bit glitchy, with extreme screen flickering. This issue can be prevented by waiting to plug in the secondary monitor until the command has already been run, but if the issue has occurred, I believe that the only fix is to log out, unplug the secondary monitor, and log back in.
Where can I begin diagnosing the cause of this issue? Is it a known bug?
When everything is working properly, this is my xrandr output:
$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1440x810+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
1920x1080 60.06*+ 59.93
1680x1050 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 60.00 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1368x768 60.00 59.88 59.85
1360x768 59.80 59.96
1280x800 59.81 59.91
1152x864 60.00
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
640x480 59.94
720x405 59.51 60.00 58.99
640x360 59.84 59.32 60.00
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 530mm x 300mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 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
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
When I have the issues in question, this is my xrandr output:
$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1440x810+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
1920x1080 60.06*+ 59.93
1680x1050 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 60.00 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1368x768 60.00 59.88 59.85
1360x768 59.80 59.96
1280x800 59.81 59.91
1152x864 60.00
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
640x480 59.94
720x405 59.51 60.00 58.99
640x360 59.84 59.32 60.00
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 530mm x 300mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 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
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
