Yes, it appears to be unity-greeter causing the trouble. It uses cairo calls to paint the root window, which it persists on the screen using X's RetainPermanent functionality, and currently the suspicion is that there's a flaw in amongst that logic.
Chris Halse Rogers is going to be working on this.
Yes, it appears to be unity-greeter causing the trouble. It uses cairo calls to paint the root window, which it persists on the screen using X's RetainPermanent functionality, and currently the suspicion is that there's a flaw in amongst that logic.
Chris Halse Rogers is going to be working on this.