Ubuntu
linux package

  1. Bug #300143
  2. Comment #8

Comment 8 for bug 300143

Revision history for this message
Tim Cole (tcole) wrote : Re: wacom tablet shows up as (non-functional) joystick

It's definitely a kernel issue; /proc/bus/input/devices reports:

I: Bus=0003 Vendor=056a Product=0042 Version=0126
N: Name="Wacom Intuos2 6x8"
P: Phys=
S: Sysfs=/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1:1.0/input/input19
U: Uniq=
H: Handlers=mouse1 event7 js0
B: EV=1f
B: KEY=18df 1f0000 0 0 0 0
B: REL=100
B: ABS=1000f000163
B: MSC=1

If I am reading the KEY bitmask correctly, the blacklist in drivers/input/joydev.c is not matching and excluding the device from being presented as a joystick, because the tablet input device does not claim BTN_TOUCH in its keybits. (BTN_TOUCH = 0x14a, which is a mask of 400 0 0 0 0 0, which doesn't correspond to any of the bits set in the above keybits.)

Looking at the upstream kernel sources for 2.6.27, it looks like BTN_TOUCH *is* be getting set for wacom tablet keybits in drivers/input/tablet/wacom_sys.c, so this may be something broken specifically in Ubuntu.