https://bugs.kde.org/show_bug.cgi?id=408247
Bug ID: 408247
Summary: [Dual monitor, powersave] taskbar showing windows from
the wrong screen
Product: plasmashell
Version: 5.15.4
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Multi-screen support
Assignee: aleix...@kde.org
Reporter: andreas_norda...@hotmail.com
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
When I come back to the computer after the screens have turned off, some times
both task managers only show the windows of the left screen, or only the
windows of the right screen, despite being configured to show the windows from
their respective screens. Reproducibility: 1/10 (guesstimate).
STEPS TO REPRODUCE
1. Have 2 screens permanently connected.
2. Have 2 panels, one on each screen.
3. Configure each panel's task manager to only show windows from their own
screens.
4. Turn both screens off, or enable screen power saving and wait for them to do
it themselves.
5. Turn both screens on, or in the screen power saving case, wiggle the mouse
or whatever for them to come on.
OBSERVED RESULT
Some times, both task managers only show windows from the left screen, and some
times both only show windows from the right screen, and some times they show
the windows from their own screens.
In this botched state, the phenomenon does not go away if I disable and
re-enable the setting to only show windows from the same screen – looks like
the affected task manager "thinks" it's on the other screen!
What works to resolve the botched state, is to turn both monitors off and on as
simultaneously as possible. It often takes a couple of tries.
EXPECTED RESULT
Each task manager should show the windows from their own screen, as configured.
SOFTWARE/OS VERSIONS
OpenSuse Tumbleweed
KDE Frameworks 5.57.0
Qt 5.12.2
plasma5desktop-5.15.4-1.1
ADDITIONAL INFORMATION
1. This bug is at least as old as this computer (december 2015).
2. My screens are identical (Dell), both connected via Displayport to the same
Intel IGP.
3. An even rarer phenomenon that also happens in the same scenario is that one
screen doesn't turn on. In this case, I can wake the unwilling screen up by
going into the Linux console (Ctrl+Alt+F1) and start Weston (`weston-launch`).
Then, if I quickly go back to X (Alt+F7), the screens will flicker briefly, but
remain on.
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