Comment 31 for bug 762938

Animtim,

Please attach your Xorg.0.log file.

I am guessing you don't have xserver-xorg-input-evdev installed. Note that in 11.04, the xserver-xorg-input-wacom input module has been moved to universe. This means it is no longer officially supported by Canonical, and it is not installed by default. Qt only understands the pressure data coming from the xserver-xorg-input-wacom input module, so you need to manually install it and log out and back in before pressure will start working.