https://bugs.kde.org/show_bug.cgi?id=456453
Bug ID: 456453
Summary: Windows in the 2nd screen are placed outside visible
area when a panel is placed between screens and
PLASMA_USE_QT_SCALING is set
Product: kwin
Version: 5.25.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: cuihao....@gmail.com
Target Milestone: ---
Created attachment 150470
--> https://bugs.kde.org/attachment.cgi?id=150470&action=edit
Screen recording that illustrates the bug
SUMMARY
Please see the attached video.
When using Xorg + dual-screen (4K & 200% scale) + PLASMA_USE_QT_SCALING=1, if I
place a plasma panel to between the two screens (or exactly, the left edge of
the right screen), the right screen become unusable and all windows placed on
it will be immediately kicked to the right edge of the screen (outside the
visible area). It's still possible to pull a window out but only moving it to
the left screen can prevent it from being misplaced again.
STEPS TO REPRODUCE
1. Create a fresh new user. Setup a plasma panel.
2. Move the panel to the left edge of the right screen of two screens placed
horizontally.
3. Move or start a window on the right screen.
OBSERVED RESULT
All windows on the right screen are misplaced outside visible area (to the
right of the right edge of the right screen).
EXPECTED RESULT
Windows are correctly placed.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux with latest packages
KDE Plasma Version: 5.25.2
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5
ADDITIONAL INFORMATION
The left screen is connected to Intel iGPU (i7-10700K).
The right is connected to NVIDIA GTX 1650 GPU, which is also the primary GPU.
Setting Intel as the primary GPU makes no change.
Why am I placing the panel between two screens: I've never intended to do this.
But another heisenbug which appears after 5.25 causes my panel to be moved from
normal place (leftmost edge) to the wrong place (left edge of the right screen)
from time to time after I unlock the screen. And whenever that happens, kwin
becomes buggy in the way I said above.
About PLASMA_USE_QT_SCALING: I hadn't set the environment variable before 5.25.
After 5.25 I noticed everything (icon/text/button) related to plasmashell
became smaller than 5.24. Someone told me the environment variable should be
set to make plasmashell use the same scale as Qt. They said it's not new in
5.25 and I should have had it set before if I didn't see inconsistent scaling
before 5.25. But the thing was I never set it before 5.25.
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