Stephan Fabel, to further root cause, could you login to a "GNOME Flashback (Metacity)" session (not a compiz-based or Unity session) via https://launchpad.net/ubuntu/+source/gnome-flashback and advise if the flickering persists?
Stephan Fabel, to further root cause, could you login to a "GNOME Flashback (Metacity)" session (not a compiz-based or Unity session) via https:/ /launchpad. net/ubuntu/ +source/ gnome-flashback and advise if the flickering persists?