I had same problem I think, look at https://bugs.launchpad.net/ubuntu/+bug/573455. But I'm not sure if it's duplicate bug but it's at least similar, I didn't test drivers from x-swapp PPA.
I had same problem I think, look at https:/ /bugs.launchpad .net/ubuntu/ +bug/573455.
But I'm not sure if it's duplicate bug but it's at least similar, I didn't test drivers from x-swapp PPA.