https://bugs.freedesktop.org/show_bug.cgi?id=105971
--- Comment #7 from Joel Sass sass.joel@gmail.com --- A note about the Xorg.0.log with amdgpu.dc=0,
I see that the amdgpu module doesn't appear to be loaded. X came up just fine without the driver being loaded, and GPU desktop acceleration still worked just fine with compiz in gnome-flashback.