I confirm that the problem is in xserver-xorg-video-intel
I have built and used the 2.20.0 version in my PPA and the problem is gone
https://launchpad.net/~andrikos/+archive/ppa/+packages?field.name_filter=&field.status_filter=published&field.series_filter=quantal
I confirm that the problem is in xserver- xorg-video- intel
I have built and used the 2.20.0 version in my PPA and the problem is gone
https:/ /launchpad. net/~andrikos/ +archive/ ppa/+packages? field.name_ filter= &field. status_ filter= published& field.series_ filter= quantal