https://bugs.kde.org/show_bug.cgi?id=388759
Bug ID: 388759
Summary: Constant screen repaints after display configuration
is changed
Product: kwin
Version: git master
Platform: Neon Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: valdi...@gmail.com
Target Milestone: ---
The screen starts to repaint multiple times a second if display configuration
is changed, causing excessive GPU load, slowdowns, and higher temperature than
expected.
How to reproduce with a laptop:
1. Boot KDE without external display connected.
2. Activate "Show Paint" kwin effect to see screen repaints. Notice that the
screen does not get repainted if there are no updates on the screen.
3. Connect external display, configure it to be the only active display using
KDE display configurator.
4. The screen start to flash because of excessive repaints.
5. Disconnect external display cable and switch to laptop display. The screen
still flashes because of repaints.
Tested on Fedora 27 and KDE Neon gitstable 20180109-1047-amd64. Reproducible
100% of the time.
I'm not completely sure if this is kwin bug or not. Please move to appropriate
component if it's not kwin.
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