Comment 28 for bug 760632

> There is also another workaround - switch to nouveau.

Desktop freezes occur with nouveau driver as well here. They are not as simple to trigger but my system is usually dead within 5 minutes after boot when using nouveau driver, one way or another. It is triggered randomly by various graphical desktop events: resizing or maximizing a window, a pop-up window overlaying another one, etc. Symptoms are the same and the system is left in unusable state.