Bug 387153 (libinput-touchpad-kcm-on-x11) - libinput-backend touchpad KCM only used on Wayland
Summary: libinput-backend touchpad KCM only used on Wayland
Status: RESOLVED FIXED
Alias: libinput-touchpad-kcm-on-x11
Product: systemsettings
Classification: Applications
Component: kcm_touchpad (show other bugs)
Version: 5.17.5
Platform: Ubuntu Linux
: VHI major
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords: usability
: 374214 384518 391693 393755 398893 (view as bug list)
Depends on:
Blocks: 383379
  Show dependency treegraph
 
Reported: 2017-11-20 15:10 UTC by Nate Graham
Modified: 2020-07-06 18:58 UTC (History)
19 users (show)

See Also:
Latest Commit:
Version Fixed In: 5.16.0


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Description Nate Graham 2017-11-20 15:10:07 UTC
[plasma-desktop git repo]/kcms/touchpad/src/kcm/touchpadconfigcontainer.cpp has the following code:

{
    Q_DECL_EXPORT void kcminit_touchpad()
    {
        if (KWindowSystem::isPlatformX11()) {
            TouchpadConfigXlib::kcmInit();
        }
    }
}

TouchpadConfigContainer::TouchpadConfigContainer(QWidget *parent, const QVariantList &args)
    : KCModule(parent, args)
{
    if (KWindowSystem::isPlatformX11()) {
        m_plugin = new TouchpadConfigXlib(this);
    } else if (KWindowSystem::isPlatformWayland()) {
        m_plugin = new TouchpadConfigLibinput(this);
    }
}

That's fine for Wayland where libinput is mandatory, but there is no logic for handling the (very common) case where libinput is being used with X11.
Comment 1 Nate Graham 2017-11-20 16:09:46 UTC
*** Bug 374214 has been marked as a duplicate of this bug. ***
Comment 2 Nate Graham 2017-11-20 16:14:12 UTC
*** Bug 384518 has been marked as a duplicate of this bug. ***
Comment 3 Weng Xuetian 2017-11-22 19:25:49 UTC
Is it really a bug?

On X11, even if you're using libinput driver, libinput is configured via XInput.
Even it's all "libinput" they will need to use different code path. You can configure touchpad with old UI for libinput X11 driver.

On the new UI side, I assume that the new UI is only designed for libinput because it don't want to carry the burden from X11 (on X11 we support synaptics and libinput), so it's only used on wayland.

FYI X11+Libinput: kcms/touchpad/src/backends/x11/libinputtouchpad.{h,cpp}
Comment 4 Nate Graham 2017-11-22 19:32:19 UTC
The old XInput-based touchpad KCM does indeed *sort of* work with libinput-on-xorg, but 90% of the UI is grayed out, since those options aren't supported on libinput. *Everything* on the Sensitivity tab is disabled! And libinput-specific settings aren't exposed (e.g. left handed mode, click method).

The result is a poor user experience. It seems like it might be possible to fix those problems, but why bother when we already have a better libinput-specific UI that's used on Wayland? When libinput is being used on X11, couldn't we show the nice UI but use the XInput backend?
Comment 5 Weng Xuetian 2017-11-22 19:35:01 UTC
(In reply to Nate Graham from comment #4)
> The old XInput-based touchpad KCM does indeed *sort of* work with
> libinput-on-xorg, but 90% of the UI is grayed out, since those options
> aren't supported on libinput. *Everything* on the Sensitivity tab is
> disabled! And libinput-specific settings aren't exposed (e.g. left handed
> mode, click method).
> 
> The result is a poor user experience. It seems like it might be possible to
> fix those problems, but why bother when we already have a better
> libinput-specific UI that's used on Wayland? When libinput is being used on
> X11, couldn't we show the nice UI but use the XInput backend?

Emm, the problem is, xinput may use different driver at the same time so I assume it's not an easy issue to resolve.
Comment 6 Nate Graham 2017-11-22 19:40:45 UTC
At least on Ubuntu-based distros, if you have xserver-xorg-input-synaptics and xserver-xorg-input-libinput installed at the same time, libinput takes precedence. So if libinput is installed, we would always want to use that as the backend, regardless of whether or not synaptics was also installed. And newer Ubuntu releases like 17.10 don't even install the synaptics one at all by default.
Comment 7 Nate Graham 2018-03-29 14:23:35 UTC
*** Bug 391693 has been marked as a duplicate of this bug. ***
Comment 8 Roman Gilg 2018-05-07 15:58:00 UTC
The Mouse KCM now has a special libinput X11 backend and uses similar GUI as with libinput Wayland backend.

There is currently a GSoC project under way to do something similar for the Touchpad KCM.
Comment 9 reescf 2018-07-28 03:50:21 UTC
Is it possible to just turn off KDM's pointer handling altogether? Or at least make it possible to run a script when configuring a device.

My problem is that I have three pointing devices: touchpad, trackpoint and intermittent USB mouse. Every time I plug the mouse in, kcminit screws up the settings for both touchpad and trackpoint.

Prior to recent updates my /etc configuration worked fine with no interference, but now KDE cannot be persuaded to just let things alone. 

Here's the config I have in /etc. This works just fine without kdminit's meddling:

# Match on all pointing devices but joysticks

Section "InputClass"
        Identifier "cfr libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

# llaw chwith : llygod = pointers *heb* touchpads & trackpoints

Section "InputClass"
        Identifier "cfr libinput llygod"
        MatchIsPointer "on"
        MatchIsTouchpad "off"
        NoMatchProduct "TrackPoint"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Left Handed Enabled" "1"
EndSection


# dim ond trackpoint
# addaswyd o https://bbs.archlinux.org/viewtopic.php?pid=1747203#p1747203

Section "InputClass"
        Identifier "cfr libinput trackpoint" 
        MatchIsPointer "on"
        MatchIsTouchpad "off"
        MatchProduct "TrackPoint"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Accel Speed" "1"
        Option "Accel Profile" "flat"
        Option "Left Handed Enabled" "0"
EndSection

# dim ond touchpads

Section "InputClass"
        Identifier "cfr libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
        Option "Tapping" "1"
        Option "TappingDragLock" "1"
        Option "Accel Speed" "1"
        Option "Left Handed Enabled" "0"
EndSection

And here is kcminit-undo, which I must run shortly after I plug a mouse in:

#!/bin/bash -
#set -x
PATH=/usr/bin
export PATH

allan=0

usage="Usage: $0 
Ceisio dadwneud kdminit sy'n torri config llygoden, touchpad a trackpoint."
error () {
        echo "$@" 1>&2
        ((allan++))
        usage_and_exit $allan
}
warning () {
        echo "$@" 1>&2
        ((allan++))
        return 1
}
usage () {
        printf %b "$usage\n"
}
usage_and_exit () {
        usage
        exit $1
}
try () {
        xinput set-prop $1 "$2" $3 || warning "Gwall: na allaf gosod  "$2" $3 am $4."
}

tempargs=$(getopt -o h --long help -- "$@")
if [ $? != 0 ];
then
        usage_and_exit
fi
eval set -- "$tempargs"

while true
do
        case "$1"
        in
                -h | --help)
                        usage;
                        exit $allan;;
                --)
                        shift;
                        break;;
                *)
                        error Unrecognised option "$1".
        esac
done


touch=$(xinput list --id-only "SynPS/2 Synaptics TouchPad")
track=$(xinput list --id-only "TPPS/2 IBM TrackPoint")
mouse=$(xinput list  | grep "Mouse" | sed 's/^.*id=\([0-9][0-9]*\)[^0-9].*$/\1/')

[[ "$mouse" != "" ]] && xinput set-prop $mouse "libinput Left Handed Enabled" 1

try $track "libinput Left Handed Enabled" 0  TrackPoint
try $track "libinput Accel Speed" 1 TrackPoint
try $track "libinput Accel Profile Enabled" "0, 1" TrackPoint
try $touch "libinput Accel Speed" 1 TouchPad
try $touch "libinput Tapping Enabled" 1 TouchPad
try $touch "libinput Tapping Drag Lock Enabled" 1 TouchPad
try $touch "libinput Left Handed Enabled" 0 TouchPad


exit $allan
# vim: set nospell: 

The module seems to have no discretion at all. It sets everything left-handed, whereas I only want the mouse that way - not the trackpoint. And it drastically slows pointer speed for the touchpad and, to a lesser extent, the trackpoint.

Please provide an option to disable this functionality in KDE without uninstalling KDE altogether. I know I have a somewhat specific setup. I don't expect a GUI to accommodate it. But the GUI needs an off switch so KDE keeps out of the way again.
Comment 10 Nate Graham 2018-09-21 16:09:02 UTC
*** Bug 398893 has been marked as a duplicate of this bug. ***
Comment 11 Nate Graham 2018-09-21 16:10:16 UTC
Doesn't seem like Furkan will be fixing this, darn. It's probably up to Roman at this point!
Comment 12 Valorie Zimmerman 2018-11-28 00:24:05 UTC
This is affecting at least some of us on the latest Kubuntu (Cosmic). I have nvidia so it will be awhile until Wayland is possible on this box.
Comment 13 Nate Graham 2019-04-05 14:01:39 UTC
We have a new patch to fix this, courtesy of the touchpad KCM's new maintainer Atul Bisht: https://phabricator.kde.org/D20186

Thanks Atul!
Comment 14 atulbi 2019-04-06 19:47:31 UTC
Welcome, Nate :D
Comment 15 Nate Graham 2019-04-23 15:36:33 UTC
*** Bug 406778 has been marked as a duplicate of this bug. ***
Comment 16 Nate Graham 2019-05-14 15:08:20 UTC
Git commit ce84d6ab4babc80707f4e4c1deb02cfe3ac5b7bb by Nate Graham, on behalf of Atul Bisht.
Committed on 14/05/2019 at 15:02.
Pushed by ngraham into branch 'master'.

[libinput-touchpad-kcm] Use wayland specific touchpad KCM UI when libinput is used on X11

Summary:
Earlier when libinput was used on X11, XInput specific UI was shown, due to which most of the options were grayed out.
Now we show libinput specific UI that is already used on wayland if libinput driver is used on X11.

- loaded all libinput properties that are available on X11.
- exposed all Q_PROPERTY to Libinput specific UI.
Related: bug 392709
FIXED-IN: 5.16.0

Reviewers: ngraham, romangg, davidedmundson, #plasma

Reviewed By: ngraham, romangg, #plasma

Subscribers: GB_2, jriddell, knambiar, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D20186

M  +1    -0    kcms/touchpad/src/backends/kwin_wayland.cmake
M  +2    -0    kcms/touchpad/src/backends/kwin_wayland/kwinwaylandbackend.cpp
M  +6    -27   kcms/touchpad/src/backends/kwin_wayland/kwinwaylandtouchpad.cpp
M  +27   -385  kcms/touchpad/src/backends/kwin_wayland/kwinwaylandtouchpad.h
C  +4    -8    kcms/touchpad/src/backends/libinputcommon.cpp [from: kcms/touchpad/src/kcm/touchpadconfigplugin.cpp - 072% similarity]
C  +130  -142  kcms/touchpad/src/backends/libinputcommon.h [from: kcms/touchpad/src/backends/kwin_wayland/kwinwaylandtouchpad.h - 084% similarity]
M  +1    -0    kcms/touchpad/src/backends/x11.cmake
M  +370  -27   kcms/touchpad/src/backends/x11/libinputtouchpad.cpp
M  +102  -2    kcms/touchpad/src/backends/x11/libinputtouchpad.h
M  +3    -1    kcms/touchpad/src/backends/x11/synapticstouchpad.h
M  +67   -0    kcms/touchpad/src/backends/x11/xlibbackend.cpp
M  +9    -0    kcms/touchpad/src/backends/x11/xlibbackend.h
M  +7    -1    kcms/touchpad/src/backends/x11/xlibtouchpad.h
M  +27   -0    kcms/touchpad/src/kcm/libinput/main.qml
M  +2    -3    kcms/touchpad/src/kcm/libinput/touchpadconfiglibinput.cpp
M  +1    -0    kcms/touchpad/src/kcm/libinput/touchpadconfiglibinput.h
M  +9    -2    kcms/touchpad/src/kcm/touchpadconfigcontainer.cpp
M  +3    -2    kcms/touchpad/src/kcm/touchpadconfigplugin.cpp
M  +1    -1    kcms/touchpad/src/kcm/touchpadconfigplugin.h
M  +2    -4    kcms/touchpad/src/kcm/xlib/touchpadconfigxlib.cpp
M  +1    -0    kcms/touchpad/src/kcm/xlib/touchpadconfigxlib.h
M  +5    -0    kcms/touchpad/src/touchpadbackend.cpp
M  +13   -1    kcms/touchpad/src/touchpadbackend.h

https://commits.kde.org/plasma-desktop/ce84d6ab4babc80707f4e4c1deb02cfe3ac5b7bb
Comment 17 Nate Graham 2019-10-27 16:31:38 UTC
*** Bug 393755 has been marked as a duplicate of this bug. ***
Comment 18 Michał Dybczak 2020-06-05 12:38:05 UTC
How this can be closed? I still have the issue, unless my bug report that was reported a duplicate wasn't a duplicate after all...


Nate, can you look into that?

The original report was here:

https://github.com/bulletmark/libinput-gestures/issues/146#issuecomment-639436753

This led to open the bug 393755 which then was marked as duplicated of this bug. This one here is marked as resolved but the issue remains!

3 swipes still create notices on desktop. Why? We hate that and we don't want that. I wished to use 3 finger swipes to libinput gestures but since this is still hard-coded in Plasma for pasting notices, the problem is still there.

After that time, UI changed drastically but the fact remains: there is no GUI for 3 swipes, and we can't change or turn it off. Plasma overrides it every time.

I'm not even sure what THIS BUG HERE was about but it looks like mine was incorrectly forwarded here.
Comment 19 Michał Dybczak 2020-07-06 18:58:51 UTC
I figured out with someone's help that the pasting notices on desktop was caused by desktop setting: emulate mouse middle click as paste. When I disabled it, the issue was gone.