Bug 426680 - evdev driver: Cannot set mouse pointer acceleration to 0
Summary: evdev driver: Cannot set mouse pointer acceleration to 0
Status: RESOLVED UNMAINTAINED
Alias: None
Product: systemsettings
Classification: Applications
Component: kcm_mouse (other bugs)
Version First Reported In: 5.17.5
Platform: Debian stable Linux
: NOR normal
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-09-18 10:42 UTC by Alexander Potashev
Modified: 2024-03-25 01:40 UTC (History)
1 user (show)

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Description Alexander Potashev 2020-09-18 10:42:22 UTC 
SUMMARY
Cannot set mouse pointer acceleration to 0.0x, minimum is 0.1x.

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.12.5

ADDITIONAL INFORMATION
Comment 1 Nate Graham 2020-09-18 21:27:51 UTC 
How are you trying to set it to zero?
Comment 2 Alexander Potashev 2020-09-19 11:59:47 UTC 
(In reply to Nate Graham from comment #1)
> How are you trying to set it to zero?

There is a "pointer acceleration" spinbox in Mouse KCM in Plasma 5.17.x, see            plasma-desktop/kcms/mouse/kcm/xlib/kcmmouse.ui:

<property name="minimum">
            <double>0.100000000000000</double>
           </property>

---

However I can't find the same control in Plasma 5.18.5, the mouse KCM looks different. Is kcmmouse.ui obsolete?
Comment 3 Nate Graham 2020-09-21 15:05:49 UTC 
Technically there are two Mouse configuration UIs:
- One for the old evdev driver which is written using QWidgets with .ui files
- One for the new libinput driver, which is written in QML

The one you see depends on which driver is installed.

Regardless, the bug you describe seems pretty easy to fix: Replace

double>0.100000000000000</double>

with

double>0.0</double>

I don't use the evdev driver so I can't tell yo whether this is an invalid value or might cause other issues. However if you use that driver and this works for you, please feel free to send a Merge Request implementing that change!
Comment 4 Nate Graham 2024-03-25 01:40:33 UTC 
Hello! This Bugzilla ticket concerns support for the non-Libinput version of the Mouse page, which is no longer supported in Plasma 6. As such, the ticket will be closed as fixing or implementing what's requested here is now out of scope.

Thanks for your understanding!