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[Bug 300143] Re: tablet devices show up as non-functional joysticks

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Christian Dannie Storgaard <cybolic@xxxxxxxxx>
Date: Thu, 23 Jul 2015 21:40:53 -0000
Reply-to: Bug 300143 <300143@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Wacom Intuos M tablets still show up as joysticks on Vivid, kernel
4.0.0-040000-generic.

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https://bugs.launchpad.net/bugs/300143

Title:
  tablet devices show up as non-functional joysticks

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Intrepid:
  Won't Fix
Status in linux source package in Jaunty:
  Won't Fix

Bug description:
  SRU justification:

  Impact: The joydev driver blacklists some input devices based on a
  keymask. This does not work for the wacom driver as this does not set
  the checked key.

  Fix: Add another key to the blacklist to catch digitizers and tablets.
  Patch prepared to be submitted upstream.

  Testcase: Running X in Intrepid and onwards will result in a broken
  joystick device visible for the tabled. Which is not there after.

  [submitted upstream]

  ---

  joydev blacklists devices that claim BTN_TOUCH (which excludes
  touchscreens and so forth), but not BTN_DIGI (which would exclude
  tablets).  Without this blacklisting, a non-functional joystick device
  appears which interferes with the function of joystick-supporting
  applications.

  This went unnoticed in the past since until recently the wacom driver
  unconditionally claimed BTN_TOUCH whether or the device was a TabletPC
  touchscreen.

  Original report:

  ---

  In Intrepid, the Wacom driver seems to create a /dev/input/js node--
  When X is running, these devices are nonfunctional--they return -32768
  on all axes, according to jstest.

  Unfortunately, this plays havoc with games that use joysticks-- if the
  tablet happens to be joystick zero, the game tries to use it, and ends
  up with a joystick that's stuck at full up-left. Udev hackery might be
  able to solve this, but for the time being i've been relegated to
  manually deleting the tablet's joystick node before starting up any
  games.

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