https://bugs.kde.org/show_bug.cgi?id=420702
Bug ID: 420702
Summary: Secondary monitor black after rotation
Product: kwin
Version: 5.18.4
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multihead
Assignee: kwin-bugs-n...@kde.org
Reporter: ro...@atchoo.org
Target Milestone: ---
SUMMARY
I have two monitors, a landscape 1680x1050 (main monitor) and a portrait
1920x1080, rotated 90 degrees anticlockwise (secondary monitor). Nvidia
graphics card, with the proprietary drivers.
When I log in, the secondary monitor is entirely black. If I move my mouse to
the monitor, I can see it. If I try to drag a window to it, I can see the mouse
cursor but no window.
If I use Ctrl-Alt-F2 to swap to a console, then swap back to the desktop the
problem is resolved and I have a notification stating that kwin restarted
desktop effects due to a graphics change.
STEPS TO REPRODUCE
1. Starting point - everything is displaying as expected, with one monitor
landscape and the secondary monitor portrait
2. Open System Settings/Display Configuration
3. Disable the secondary monitor and click Apply
4. Enable the secondary monitor (this will have reverted to landscape mode) and
click Apply
5. -> The monitor should now display the desktop as normal (although in the
wrong orientation in my case)
6. Click on "90 degrees anticlockwise" orientation, then click Apply
7. -> The monitor will be black, with a visible mouse cursor
The same behaviour is shown going from no rotation to 90 degrees clockwise, or
from 180 degrees rotation to either of the portrait orientations, but it works
fine going from no rotation to 180 degrees.
OBSERVED RESULT
The secondary monitor is entirely black, but with a visible mouse pointer.
Attempting to move windows to the secondary monitor shows the mouse pointer but
no window.
EXPECTED RESULT
A normal desktop showing on the monitor.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
kwin version: 5.18.4.1-0ubuntu2
ADDITIONAL INFORMATION
This is easily reproduceable, I can provide more details / debugging if needed.
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