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[sander <1846183@xxxxxxxxxxxxxxxxxx>]

Updates:

1) The workaround is only temporarily working. After some time of
handling both the mouse and the Wacom tabled, Xorg consistently keeps
crashing. Obviously, this is making using the tablet under Ubuntu
unworkable.

2) I tried using the tablet in a Wayland session and that seems to solve
the crashing of the whole session. However, after some time the buttons
and scroll wheel on my mouse stops working and I need to restart the
session to get it to work again. Unplugging and reconnecting any or both
USB devices does not fix the buttons on the mouse.

A wild guess: maybe the same bug in the kernel is causing Xorg to crash
and to break mouse buttons when running Wayland.

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https://bugs.launchpad.net/bugs/1846183

Title:
  Xorg crashes when touching an unmapped button

Status in xf86-input-wacom package in Ubuntu:
  New

Bug description:
  When touching an unmapped tablet button, Xorg crashes. This happens
  immediately when working in Gimp and might need a few presses when
  Gimp is not open.

  This bug is very consistent and I can repeat it always, even after a
  reboot.

  Workaround: I configured all unmapped buttons on the tablet to map to
  <alt>+<tab> and this seems to prevent the crashes. Of course, this
  does not fix this nasty bug.

  
  I have a Wacom Intuos Pro 2 M attached to a Dell XPS 13 9380 laptop with Ubuntu 18.04.3 LTS.

  
  /var/log/kern.log shows the lines like the following:
  kernel: [ 1710.477890] rfkill: input handler disabled
  kernel: [ 1710.477890] rfkill: input handler enabled

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