Created attachment 68683 [details]
Xorg.0.log

Using AMD A4-3420M APU, have NOT been able to use the R600 driver on either
Suse (12.x, factory), Arch Linux (latest built, or git xorg/mesa/dri build), or
Ubuntu (12.04, 12.10b2). ALL various combinations of xorg 1.12/1.13,
xorg-video-ati, mesa, and kernel 3.5-3.6 give the same black screen after
startup, transition to Xorg corrupts all VT's. 

KMS for Single user or non-X sessions works fine. Grub boot with
"radeon.audio=0" does alleviate some corruption on VT7 (but not enough to be
usable). Changing accel options or even disabling accel has no effect.

Appears there is something specific to the A4-3420M(6410D, chipID 0x9644,
identified by system as a Sumo2) that is affected by this.