https://bugs.kde.org/show_bug.cgi?id=468217
Bug ID: 468217
Summary: xf86-input-libinput 1.3.0 DPI and mouse acceleration
issue on KDE Plasma X11
Classification: Plasma
Product: kwin
Version: 5.27.3
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libinput
Assignee: kwin-bugs-n...@kde.org
Reporter: spider.gam...@outlook.com
Target Milestone: ---
SUMMARY
There is an issue with mice on KDE Plasma 5.27.3 in X11 when using
xf86-input-libinput 1.3.0. Connected mice have their sensitivity changed (might
be a DPI change), this change results in either higher or lower sensitivity.
The connected mice also have mouse acceleration turned on, even when though the
mouse is configured with a "flat" acceleration profile.
This may be limited to higher polling rate "gaming" mice (500+ Hz), but this is
unconfirmed.
Some community discussions that might shed more light:
https://old.reddit.com/r/EndeavourOS/comments/12chils/mouse_sensitivity_issue_after_yesterdays_update/
https://old.reddit.com/r/kde/comments/12cp02s/issue_with_xf86inputlibinput_130_on_kde_plasma_x11/
STEPS TO REPRODUCE
1. Install KDE Plasma on an Arch Linux based OS (e.g. EndeavourOS).
2. Login in X11 mode.
3. Configure KDE Plasma mouse settings to: Sensitivity 5/10, flat acceleration
profile.
4. Optional: Also configure the gaming mouse in its own software.
5. Update system to the latest versions, including xf86-input-libinput to
1.3.0-1.
6. Optional: In case xf86-input-libinput version 1.3.0-1 is already installed
out of the box, use the downgrade command to downgrade to version 1.2.1-1 in
order to compare.
OBSERVED RESULT
1. Mouse acceleration turned on, no way to turn off. Setting is still "flat"
acceleration profile.
2. Higher or lower mouse sensitivity/DPI.
EXPECTED RESULT
1. "Flat" acceleration profile is respected.
2. Mouse sensitivity/DPI is the same as on xf86-input-libinput 1.2.1.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
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