I would like to add something here :
About two month ago I bought the first A10 notebook that came on the market ( where I live, anyway ), an Acer V3 with an A10-4600M APU + dedicated 7670M video card.
From the begging it was all a pain in the ass. No drivers for either linux or windows : Acer shipped it with a CD with a bad 'VGA' driver only (for windows) that didn't work.
Alas, the catalyst 12.6 beta came and it worked ok-ish on windows ( not that I use windows very much, but sine the laptop was unusable in linux I had to ) and I finally got some semblance of a driver for Linux. Aside from the annoying watermark with 'unsupported driver' I find the 'capabilities' of the Linux driver laughable. It can't handle multi-monitor without restart, It can't handle switching between integrated gpu in the apu and the discrete gpu, you have to manually select one and reboot and the performance in pts and such is rather disappointing, from a laptop with a quad core that overclocks up to 3.2 GHz ( it really does work ), 16 GB DDR3 1600 and an SSD.
I have a Phenom X6 with a gf 450 on it as my desktop and it mops the floor with ATI both in native games and in games played through wine. Also, I tried a few OpenCL samples that simply don't work with the fglrx.
Now, on to the new driver 12.6 'stable', to my surprise it simply does not work. It generates a wrong xorg.conf from which xserver can't start and if I try to hack it 'by hand' from the 12.6 beta it crashes with stable 3.2 and 3.4 kernels. I had to revert to 12.6 beta.
Also I tried the open source driver but it seems trinity crossfired with a 7xxxM was too much for it, it is basically unusable. Note that without the amd blob you can't shut down the dedicated gpu so the laptop gets too hot to handle simply by having a xfce with a terminal with vim in it ...
Clearly this is my last AMD purchase with regards to video cards. Unfortunately, since you can't buy an AMD mobile cpu paired with an nVidia gpu, I'll have to pick an Intel notebook or, if ARM64 shapes up, hopefully an ARM-based laptop.