https://bugs.kde.org/show_bug.cgi?id=512992
Bug ID: 512992
Summary: Changing scroll speed affects discrete scroll amount
on free spinning mice with a lock feature.
Classification: Plasma
Product: kwin
Version First 6.5.3
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
After updating KDE Plasma recently, I noticed that when I scroll in some games
an individual scroll would be counted twice. When I decreased the scroll speed
some scrolls would instead be skipped. After a bit of testing with `wev` I
noticed that occasionally the discrete value for a single scroll would be more
than 1 if the scroll speed was high, or the scroll event would be skipped
entirely if the scroll speed was low.
STEPS TO REPRODUCE
1. Get a mouse like the Logitech G502 with a free spinning wheel with a
toggle-able lock
2. Lock the scroll to discrete notches
3. Run `wev` or other application that relies on discrete scroll and observe
the abnormal scroll events.
OBSERVED RESULT
Discrete scroll in applications running under kwin does not align with actual
individual discrete scroll, and is either higher or lower than expected
depending on scroll speed setting.
EXPECTED RESULT
Discrete scroll should not be affected by scroll speed.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.17.9-200 (Nobara 43)
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.0
ADDITIONAL INFORMATION
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