Comment 42 for bug 33368

BusType PCI in Device Section resolved the problem.

I'm not sure it's a duplicate, but my problem is solved. Needless to say that it isn't ideal because it should work out of the box. So if you want to close the bug, for me it's ok.

I wrote an answer on the other bug too:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-savage/+bug/33617
(But maybe that's another problem from Brian Heung, in my case the hole system freezed.)