https://bugs.kde.org/show_bug.cgi?id=491251
Bug ID: 491251
Summary: Apps open on wrong display depending on mouse cursor
movement and launch method
Classification: Plasma
Product: kwin
Version: 6.1.3
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: bllcha...@myuct.ac.za
Target Milestone: ---
SUMMARY
I have 2 displays - a primary 4K @ 200% scaling (DisplayPort), and a secondary
1080p @ 100% scaling (HDMI), using Wayland.
When no apps are open, or all app windows on the primary display are minimized,
opening a new app window from the Application Menu or KRunner results in the
app window appearing on the secondary display, even though the mouse cursor was
placed on the primary display during app launch, but only if the mouse cursor
is not moved after opening the app. If you move the mouse cursor immediately
after clicking the app, it will launch on the correct display. If an existing
app is open and visible (not minimized) on the primary display, the app will
launch on the correct display regardless of mouse cursor movement. Launching
apps from the panel Task Manager shows correct behavior regardless of mouse
cursor movement or existing visible app windows.
Even entering "Edit mode" by right-clicking the desktop, and clicking "Display
Configuration" for example, without moving the mouse (keep it dead-still)
results in the window opening on the incorrect (secondary) display.
STEPS TO REPRODUCE
1. Set up 2 monitors, one primary at 200% scaling and one secondary at 100%
scaling.
2. Close all app windows.
3. On the primary 200% scaling display, use the Application Menu or KRunner to
launch an app such as Dolphin or Konsole, but do not move the mouse after
clicking (hold the mouse dead-still during/after the click).
4. Observe the app window opening on the incorrect display.
5. Close all app windows and try launching again, but this time move the mouse
cursor constantly just after clicking.
6. Observe the app window opening on the correct display (the one the mouse
cursor is moving around on).
SOFTWARE/OS VERSIONS
Linux: 6.10.2-arch1-2 Arch Linux (up-to-date as of August 4, 2024)
KDE Plasma Version: 6.1.3 (Arch package plasma-desktop 6.1.3-1)
Qt Version: 6.7.2 (Arch package qt6-wayland 6.7.2-4)
ADDITIONAL INFORMATION
I am using an AMD Radeon R9 390X (Hawaii) GPU with amdgpu driver, Mesa, RADV
Vulkan. The secondary display is configured to be to the left of the primary
display. XWayland apps are set to "Apply scaling themselves".
There is another multi-monitor bug that affects some apps (such as
LibreOffice), with LibreOffice using incorrect scaling depending on the order
of monitor wake-up/connection (it will use the scaling value from the first
connected display regardless of Plasma/KScreen settings, only replugging
monitors in the correct order resolves the issue). But I assume this should be
a separate bug report from this one, as I am not sure if they are related.
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