Comment 10 for bug 712103

I experience this in precise, but only when running a unity session, and also not really reliably on two (sandy-bridge) systems.

One system is a desktop PC running a radeon 6670 graphics card. There, I experienced this each time when resuming after suspending the machine reliably. Switching from unity to gnome3 seems to help.

The other system is a laptop that was recently upgraded to precise. I have added a session item that locks the screen when logging in (because the system is configured to auto-login). Here, the described symptom happens already at login time.