https://bugs.kde.org/show_bug.cgi?id=496531
Bug ID: 496531
Summary: libinput acceleration profile incorrectly set to
"flat", contradicting the libinput default
Classification: Applications
Product: systemsettings
Version: 5.27.11
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_mouse
Assignee: plasma-b...@kde.org
Reporter: jeff...@aosc.io
CC: duha.b...@gmail.com, natalie_clar...@yahoo.de
Target Milestone: ---
On a Lenovo ThinkPad X280, I observed that Plasma 5.27.11, upon the first
startup, set the mouse (as which I assume TrackPoints also counted, see:
https://bugs.kde.org/show_bug.cgi?id=463825) acceleration profile to "flat,"
making it painfully slow even when dragging with full force.
Running `xinput list-props` on the TrackPoint devices yields the following
regarding libinput acceleration profiles:
libinput Accel Profiles Available (342): 1, 1, 1
libinput Accel Profiles Enabled (343): 1, 0, 0
libinput Accel Profiles Enabled Default (344): 1, 0, 0
Which, according to libinput's latest documentation, meant that all three
(adaptive, flat, and custom) profiles are available to the TrackPoint, with
"adaptive" enabled as default on this device. However, upon checking
~/.config/kcminputrc, we see:
[Mouse]
X11LibInputXAccelProfileFlat=true
Contradicting with libinput's defaults. I can assure that I have not altered
this setting via neither xinput(1) nor any Xorg configuration files, since the
acceleration profile is correct in SDDM and was only set to "flat" upon login
(I have also tried setting the "flat" profile in an Xorg configuration and the
TrackPoint became painfully slow in SDDM as well, so I think my findings are
consistent).
I have also pin-pointed the issue to commit fb8a655a7376 ("If no config option
for accel profile is selected, use default from Xorg") - reverting which fixed
the issue for me, but obviously, that was due to a hard-coded "adaptive"
profile. So, it would appear that the
X11LibinputDummyDevice::getDefaultConfigFromX() function return-ed in the
middle, before the flat profile property could be set to "false" (and fell back
to "true"), hence this issue.
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