By "work" I mean having "hovering" and "keepshape" mode, not just a worthless slow "pen-mouse". My thinking is that it wasn't working due to concurrent configuration files. There isn't only xorg.conf, but on /etc/X11 there is a xorg.conf.d folder, and there there was a ##-wacom.conf or something, with different settings than the ones I had set manually on xorg.conf.
HAL is deprecated, or something like that, and I don't have any .fdi file for...