I'm using fglrx 14.6beta with my A10-7850K perfectly fine. I'm using sabayon. My main issue is that AMD wont %^*ing fix Hybrid Crossfire!!!! Its greyed out and if you attempt to enable it manually it says:
darksurf@sabayon ~ $ aticonfig --cf=on --adapter=0,1
Warning: No MGPU chain defined for master adapter 0
Crossfire chain(s) enabled
CrossFire does not support on this platform
Warning: X needs to be restarted before CrossFire changes take effect.
BULL%^&* !!! I know for 100% of a fact it is supported! I can't believe I payed $1000 to make a steambox rig and AMD is screwing me with their crappy drivers!