The pressure sensitivity issue has been a troublesome issue for Maya users on Linux with Wacom devices. Maya's tutorials state:
Wacom's site will then direct you to the Wacom Linux project. You should find the success stories at the Linux Wacom project useful in helping you to get things working. See here for more info http://linuxwacom.sourceforge.net/index.php/howto/successhttp://linuxwacom.sourceforge.net/index.php/howto/success