https://bugs.kde.org/show_bug.cgi?id=469295
Bug ID: 469295
Summary: Stuck or involuntary mouse drag events when Pointer
Threshold is Close or Equal to Drag Start Distance
with Logitech MX518 and other mouses
Classification: Plasma
Product: kwin
Version: 5.23.2
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: libinput
Assignee: kwin-bugs-n...@kde.org
Reporter: lanthrus...@gmail.com
Target Milestone: ---
SUMMARY
You can mostly see this bug happening while clicking in Chromium browser or
other browsers, sometimes which seems random at first, when you click on an
image or a menu on a web page it's displayed like it's going to be dragged
although you released mouse left button and you can move that stuck in drag
position block or image up or down without holding any mouse buttons, like
you're actually dragging it.
It happens with both libinput driver and mouse-evdev driver and in case of
libinput you don't have a reliable workaround yet switching o mouse-evdev to
provides you an opportunity to apply a workaround I found trying to fight with
that bug described below. To work around this problem set:
Pointer acceleration : 2.1
Pointer threshold : 1 pixel
Drag Start Distance : 4 pixels
To make this bug happening often you would have to set:
Pointer acceleration : 2.1
Pointer threshold : 4 pixel
Drag Start Distance : 4 pixels
it happens with me with Logitech MX518 and it's a new issue which I first
started seeing with Neon.
Basically what happens here is that when Pointer threshold is equal to Drag
Start Distance and you click on the mouse it's often that
the mouse physically slides slightly at the moment the left mouse button is
clicked and when this happens and Pointer Threshold is equal to Drag Start
Distance (which is default for libinput as it seems) - the block the mouse is
clicked on gets stuck quite often in Drag position involuntarily which is very
annoying.
The same issue is described here:
https://forum.manjaro.org/t/drag-start-mouse-settings-dont-seem-to-do-anything/117793/3
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux 5.4.80-gentoo-r1-x86_64 #1 SMP PREEMPT
(available in About System)
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Mouse: Logitech MX518 (checked two of them, same bug with both)
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