Rated 3 out of 5 stars
Black screen. Crashed X server and GDM.
Suse Linux Enterprice Desktop 12 SP3, Seamonkey 2.49.1
UPD: I'm using Gallium 0.4 on AMD RS880 (DRM 2.43.0 / 4.4.73-5-default, LLVM 3.8.0)
GDM? Impossible. It runs as a different user.
It's probably something with your graphics driver.