Hi Walter,

I would suppose this is a permission issue. The devices list within gimp
should at least show the mouse, actually mine has lots of entries.

I suppose that in Excalibur/Trixie either GTK-3 or Gimp have some
dependency regarding device permission handling such that Gimp won't have
the permission to access your input devices.

Can you please check the output of the following command
running from a terminal within your xsession:

andi@zeus:~$ loginctl session-status
1 - andi (1100)
           Since: Mon 2025-07-21 18:46:30 CEST; 3h 9min ago
          Leader: 2867 (lightdm)
            Seat: seat0; vc7
         Display: :0
         Service: lightdm; type x11; class user
         Desktop: mate
           State: active

cheers,
Andreas
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