i did not read all post (sorry)
i want add some url from wacom...
Wacom Technology - Linux Driver Downloads
this is official
no info about support of graphire 4...
so if your graphire is working it is great...
some years(3 or so) ago i try intuos 3 on SLED 10 and it was working... i draw something with it in gimp... the primary work was with inkscape and i decide that tablet is not comfortable to work with vector, i still use mouse

drivers that i use i compile from source
download from
The Linux Wacom Project
i did not remember is all buttons work normally...