[Wayland-bugs] [Bug 106786] Magic Trackpad stopped to work with libinput 1.10.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106786

--- Comment #5 from Mario <mario.diraimondo at gmail.com> ---
Ok, it looks that the problem is the use of libinput-gestures (that uses
libinput-debug-events to gather events).

Let's see what I discovered step-by-step:
$ evemu-record /dev/input/event23
error: this device is grabbed and I cannot record events
see the evemu-record man page for more information

$ fuser -v /dev/input/event23
                     USER        PID ACCESS COMMAND
/dev/input/event23:  mario      1353 F.... libinput-debug-
                     mario      1389 F.... gnome-shell

$ ps aux | grep libinput
mario     1337  0.1  0.0  41556 11856 ?        Ss   11:35   0:00
/usr/bin/python3 /home/mario/.bin/libinput-gestures
mario     1353  0.2  0.0  35736  4252 ?        S    11:35   0:00
libinput-debug-events

$ systemctl --user stop libinput-gestures.service

(external trackpad started to work! the internal one of the XPS 13 worked in
any case with any version of libinput)

$ systemctl --user start libinput-gestures.service

(now libinput-gestures gather gestures from both the trackpads)

It looks something changed in libinput and this create badly conflict with the
(weird) method used by libinput-gestures to gather event notifications.

Note the I use libinput-gestures option 'device all' in order to catch events
from multiple devices: including the device attached after service launch.
I think this is the schedule in my system:
- libinput-gestures launch libinput-debug-events;
- the external bluetooth device is later connected.

Is it normal that libinput doesn't make the external device to work if an
instance of libinput-debug-events is running? As proof of this: if after the
previous steps (so with everything working) I switch off the bluetooth
trackpad, wait some seconds and reconnect it: the problem is there again.

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