https://bugs.kde.org/show_bug.cgi?id=460517
Bug ID: 460517
Summary: Plasma 5.26 completely breaks my multi-monitor setup
Classification: Plasma
Product: kwin
Version: 5.26.0
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@zaister.de
Target Milestone: ---
SUMMARY
***
After updating to Plasma 5.26 my system now becomes completely unusable after
waking up from power save mode, or after switching the monitors that I use for
multiple machines back to the KDE machine.
Let me describe my screen setup.
1) My main screen is a 4K monitor at 3840×2160 resolution, connected to the
DP-0 port.
2) My secondary screen is an HD monitor at 1920×1080 resolution, connected to
HDMI-0.
3) My main screen is to the right of the secondary screen.
Until Plasma 5.26 this has mostly worked, but with flaws: when the system wakes
up or regains control of the monitors, windows on the main screen were moved
around a certain distance to the left, overlapping both monitors. Some windows
on the main screen that were maximized vertically were resized to the lesser
height of the secondary screen. Rather annoying, but more or less workable.
Now, with Plasma 5.26 this behavior has been replaced with something even
worse. When the system wakes up now, the main monitor is completely deactivated
(“NO SIGNAL”), and plasma tries to paint both screens on the secondary monitor.
The screens overlap on the secondary monitor, and the screen that is too big
scrolls around in the top half of the monitor when I move the mouse pointer.
The system is completely unusable after that.
By the way, after killing the X-Server and logging in again, the main monitor
keeps being deactivated until I manually delete the folder
~/.local/share/kscreen.
***
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Plasma
KDE Plasma Version: 5.26
KDE Frameworks Version: 5.99
Qt Version: 5.15.5
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