Looks like you're running with an older wacom.ko version, which didn't include you're tablet.
Download the latest input-wacom-0.10.10-1 from here:
Brand new! No need to manually patch wacom_wac.c, anymore. *yay*
I assume you're xf86-input-wacom is up to date... So your tablet (0xDA) is already included in there.
- dr4ziw -