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.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
--
wacom tablet shows up as (non-functional) joystick
https://bugs.launchpad.net/bugs/300143
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