[Bug 597123] [NEW] wacom kernel driver ends up in non-working state after first unplug

[Tim Cole]

Public bug reported:

Once a wacom USB tablet is unplugged, the wacom driver enters a non-
working state.  If the tablet is plugged in again, the device will be
detected, but it won't generate any events. udev and device creation
appear to work as normal, however.

Steps to reproduce *when X is not running, e.g. via `stop gdm`*:

1) plug in the wacom tablet (if it isn't already plugged in)
2) `sudo evtest /dev/input/wacom`
3) scribble on the tablet surface with the stylus and note that events are reported
4) unplug the tablet
4b) note that /dev/input/wacom no longer exists
5) plug the tablet back in
5b) note that /dev/input/wacom exists again
6) `sudo evtest /dev/input/wacom`
7) scribble on the tablet surface with the stylus again

Expected result:

Events are generated, like the first time the tablet was plugged in.

Actual result:

No events are generated.

The tablet doesn't start working again until the machine has been
rebooted.

===

uname -a:
Linux bede 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 22:02:19 UTC 2010 i686 GNU/Linux

apt-cache policy linux-image-2.6.32-22-generic:
linux-image-2.6.32-22-generic:
  Installed: 2.6.32-22.36
  Candidate: 2.6.32-22.36
  Version table:
 *** 2.6.32-22.36 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
        100 /var/lib/dpkg/status

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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wacom kernel driver ends up in non-working state after first unplug
https://bugs.launchpad.net/bugs/597123
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