https://bugs.kde.org/show_bug.cgi?id=513879
Bug ID: 513879
Summary: KWin on Wayland ignores kcminputrc mouse input changes
unless external inotify watch exists
Classification: Plasma
Product: kwin
Version First 6.5.4
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
KWin's file monitoring system fails to detect changes to ~/.config/kcminputrc
for mouse input device settings on Wayland. The System Settings GUI checkbox
for "Invert scroll direction" updates the config file but KWin never applies
the changes.
**Steps to Reproduce:**
1. Launch Plasma on Wayland
2. Open System Settings → Input Devices → Mouse
3. Toggle "Invert scroll direction" checkbox
4. Test mouse scroll wheel
**Actual Result:**
Scroll direction does not change. The setting is written to kcminputrc but KWin
ignores it. Persists across qdbus reconfigure, plasmashell restarts,
logout/login, and reboots.
**Expected Result:**
Scroll direction should change immediately when checkbox is toggled.
**Workaround That Reveals Bug:**
Terminal 1: tail -f ~/.config/kcminputrc
Terminal 2: systemsettings kcm_mouse
Now toggle the checkbox → IT WORKS
**Analysis:**
KWin's inotify watch on kcminputrc is not functioning. When tail -f creates an
external inotify watch on the same file, KWin's watch suddenly starts working.
This suggests the file monitor initialization is broken or has a race condition
specific to Wayland.
**System:**
Garuda Linux, Kernel 6.18.2-zen2
KDE Plasma 6.5.4, KWin Wayland
Mouse: HS6209 2.4G Wireless Receiver (affects all mice)
Triggered after restarting PipeWire/Wireplumber services.
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