https://bugs.kde.org/show_bug.cgi?id=464735
Bug ID: 464735
Summary: kwin emits no or wrong key events when binding extra
mouse buttons on Wayland
Classification: Plasma
Product: kwin
Version: 5.26.90
Platform: Exherbo
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: kwin-bugs-n...@kde.org
Reporter: li...@bernd-steinhauser.de
Target Milestone: ---
SUMMARY
If the extra mouse buttons are configured via kcm_mouse, on some occasions, the
event is not carried out.
It can also happen that actually a different key event is emitted, i.e. one
that was configured for a different button.
e.g. my kcminputrc right now is:
[ButtonRebinds][Mouse]
ExtraButton1=Key,Ctrl+PgUp
ExtraButton2=Key,Ctrl+PgDown
ExtraButton3=Key,Ctrl+W
(btw, shouldn't these settings be in the device-specific part of the config
file?)
So kcm seems to generate the file correctly, the Button numbers and key
combinations match what I set in the kcm.
However, when I press one of the buttons, e.g. in a browser window (Falkon or
Firefox), for Extra Button 1 and 3, it emits Ctrl+W, for Extra Button, nothing
is emitted (it also doesn't do its default function "back"). This is persistent
even after restarting the system.
I'm not sure if kwin is at fault here or if it's the kcm, but something is not
working as it should.
bug 460345 looks similar, but is already fixed in the version I'm running.
STEPS TO REPRODUCE
1. Use a mouse with configurable extra buttons (so at least 8 buttons?)
2. Assign key combinations to these buttons
3. Check whether the configured key combinations are emitted
OBSERVED RESULT
No or the wrong key combination is emitted in some cases.
EXPECTED RESULT
The configured key combinations should be emitted when a button is pressed.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.26.90 (I think it is also present on 5.26, but I'm not 100%
sure.)
KDE Plasma Version: 5.26.90
KDE Frameworks Version: 5.102.0
Qt Version: 5.18.8
ADDITIONAL INFORMATION
I'm using a Logitech M705 mouse. This mouse has a total of 10 buttons, of which
button 10 (the thumb button) is not used in a standard config.
On X, I assign this button via imwheel to the key combination Ctrl+W to quickly
close windows/tabs in certain programs like Falkon or Firefox.
Additionally, I assign the left/right click of the scroll wheel to Ctrl+PgUp
and Ctrl+PgDown to switch tabs in the browser. I never use the lef/right click
of the scroll wheel to navigate left/right anywhere, so would be wasted
functionality for me.
Now obviously, imwheel does not work on Wayland anymore, so for Wayland I need
a different solution. Fortunately, kwin seems to support configuring mouse
buttons on Wayland, so I tried it.
On Wayland, 3 extra mouse buttons are recognized. 1 and 2 are the buttons that
are configured as forward and back in a standard config. Extra Button 3 is what
is recognized as Button 10 on X11 and does not have a standard function
assigned to it.
I started with this button and assigned the key combination Ctrl+W to it. At
first, this did not work at all, so at first I thought that this functionality
is completely broken.
I did later on investigate more and found that I also can set Extra Button 1
and 2 and so I tried that and came up with the configuration above. This is not
exactly what I want, since I would have to give up the forward/back
functionality, but it's better than nothing.
However, I did then find out, that the behavior changed and now two buttons
result in Ctrl+W, while Button 2 does nothing, as described above.
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