Mouse input blocked in Wayland KDE Plasma 5

[nitrogar]

Describe the bug
I am using Manjaro in Wayland with two monitor setup, and when i start gromit the screen freezes until i kill gromit.
the problem does not happen on xorg only Wayland.

I would like to help in finding the bug more precisely but i don't know how to debug it since it freezes the screen upon launch

but I noticed that not all the desktop environment are frozen I can spawn terminal using short-cut but the mouse pointer disappear and i cant interact with any opened window

To Reproduce
just directly launching gromit on wayland

Environment (please complete the following information):

• Gromit-MPX version: Gromit-MPX 1.5.1

• Flatpak or Distribution-package or Built-from-source: AUR gromit-mpx

• OS and version: manjaro

• Desktop Environment and version: KDE Plasma

• X11 or Wayland session: wayland

• Operating System: Manjaro Linux

• KDE Plasma Version: 5.27.10

• KDE Frameworks Version: 5.115.0

• Qt Version: 5.15.12

• Kernel Version: 6.1.80-1-MANJARO (64-bit)

• Graphics Platform: Wayland

• Processors: 24 × AMD Ryzen 9 3900X 12-Core Processor

• Memory: 31.3 GiB of RAM

• Graphics Processor: AMD Radeon RX 6500 XT

[bk138]

OK, can repro on KDE Wayland Manjaro using Gromit-MPX flatpak.

[bk138]

Seems like a Plasma bug/feature w.r.t https://docs.gtk.org/gtk3/method.Widget.input_shape_combine_region.html - maybe upgrading to Plasma 6 might help?

[srikargottipati]

I encountered the same issue on Plasma 6 Wayland too. Gromit tray icon does not even respond to mouse clicks. Atl+F9 also does not kill gromit, not fix the issue either.

[bk138]

Hmm works in GNOME Wayland. Could someone open a report at upstream KDE and link this here? I can provide technical details then.

[bk138]

Investigate #136

[lmtreser]

Hello!
I'm running Kubuntu and I have the same problem. I am available to help. Greetings.

Operating System: Kubuntu 23.10
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.0-27-generic (64-bit)
Graphics Platform: Wayland

[bk138]

@lmtreser thanks a lot! If you're fit in C coding, what would help is a minimal gtk-based program to reproduce the issue for upstream KDE that creates a simple window that via gtk_widget_input_shape_combine_region() is transparent to input (lets clicks though) on KDE X11 but not KDE Wayland. This basically is what Gromit-MPX does.

[lmtreser]

Hello!
When updating Kubuntu to 24.04 LTS, several things that didn't work are now OK... For example Gromit. Solved!

[bk138]

@lmtreser can you post your exact KDE version for us please?

[lmtreser]

I rushed to post this message, because I just realized that by default Kubuntu 24.04 starts the session in X11 and not in Wayland... The problem persists on the Wayland session 😔.

Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.8.0-31-generic (64-bit)
Processors: 4 × 11th Gen Intel® Core™ i3-1115G4 @ 3.00GHz
Memory: 7.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics