(Quick-note) Troubleshooting Dual Monitor Issues on KDE on Ubuntu/ Linux Mint
TLDR
Learn how to troubleshoot and resolve issues with dual monitors on KDE, especially when one monitor stops working or remains off.
Context
By default, KDE handles dual monitors well on a new installation. However, sometimes one monitor might stop working and stay off. This happened to me, and I had to fix it using xrandr and KDE's display settings.
Steps
Here is how I resolved my issue:
- Run xrandr Query:
xrandr --query
This showed two activated displays.
- Copy Display Names: I identified display names from the xrandr output.
❯ xrandr --query Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 16384 x 16384 HDMI-A-0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 144.00*+ 120.00 99.95 59.95 3840x2160 30.00 25.00 24.00 29.97 23.98 1920x1200 144.00 1920x1080 120.00 119.88 60.00 60.00 50.00 59.94 1600x1200 144.00 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1280x800 59.91 1152x864 75.00 1280x720 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 DisplayPort-0 connected primary 2560x1440+2560+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 59.95*+ 1920x1200 59.95 1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98 1600x1200 59.95 1680x1050 59.95 1280x1024 75.02 60.02 1440x900 59.89 1280x960 60.00 1280x800 59.81 1152x864 75.00 1280x720 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 DisplayPort-1 disconnected (normal left inverted right x axis y axis)
- Execute Command:
xrandr --output HDMI-A-0 --mode 1920x1080 --right-of DisplayPort-0
I set HDMI-A-0
as the main display, right of DisplayPort-0
.
-
Adjust in KDE Preferences: I went to Preferences > Display Configuration. I set the desired resolutions and applied the changes.
-
Fix Overlap: When there was overlap, I changed both monitors to a lower resolution, applied changes, then set the preferred resolution again.
Following these steps fixed my issue, and both monitors worked correctly.
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