https://bugs.kde.org/show_bug.cgi?id=481347
Bug ID: 481347
Summary: Support for advanced libinput configuration / button
scrolling
Classification: Applications
Product: systemsettings
Version: 5.27.10
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: kcm_touchpad
Assignee: plasma-b...@kde.org
Reporter: waterlub...@rocketmail.com
CC: natalie_clar...@yahoo.de
Target Milestone: ---
SUMMARY
I've unfortunately run into an issue on my laptop where libinput ignores MMB
due to it activating "button scrolling" (see
[here](https://wayland.freedesktop.org/libinput/doc/latest/scrolling.html#on-button-scrolling))
by default. While I have filed a [bug
report](https://gitlab.freedesktop.org/libinput/libinput/-/issues/971) with
them already, it's impossible to work around - or configure - this problem, and
it'll likely end up as WONTFIX on libinputs end, as this button scrolling
behavior is intended to be configurable.
I would like the ability to enable or disable button scrolling for a touchpad;
this is applicable to touchpads with a physical MMB, which will not function
correctly with button scrolling enabled. From what I understand of the
documentation and "kcminputrc"/touchpad KCM, I might be able to implement this
myself, but would probably need some help as I've yet to tear into KDE
internals this deeply before.
As an alternative, a system of shimming in arbitrary configs for libinput would
be very helpful. As far as I can tell, libinput (on Wayland) can only be
configured by the DE, barring nasty hacks like libinput-config (which is no
longer maintained). The ability to shim in arbitrary libinput configurations,
even if they're only available by editing .rc files, would be very helpful.
DESIRED FEATURE
1. Support for enabling or disabling [button
scrolling](https://gitlab.freedesktop.org/libinput/libinput/-/issues/971) for
touchpad devices, or;
2. Generic support for all libinput configurations via a shim somewhere (this
may need to occur elsewhere in Plasma?)
Apologies if this is the wrong place to file this. Unfortunately, this is one
of those "split responsibility" areas between Wayland and Plasma, so I'm not
sure where the fix belongs. Libinput ought to include a more sensible default
on this machine, but a configuration option would still be useful for e.g
laptops with a trackpoint that the user does not desire to use.
STEPS TO REPRODUCE
1. Acquire a laptop with a touchpad, physical MMB, and (possibly) history of
trackpoint mice availability. I had a Precision 7750.
2. Press and hold MMB, note that the events are delayed until after release due
to libinput trying to perform button scrolling with a nonexistent trackpoint.
3. Wallow in agony at the lack of a configuration option to disable button
scrolling.
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