I recently upgraded my MythTV box, which runs MythBuntu 14.04, to use an MSI A88X-G43 motherboard with an AMD A10-6700 APU. The system reboots as soon as it's started when I use a 3.13.0 or later kernel. (I've filed a bug report
about this.) The motherboard has some other problems, so I'm not happy with it, but these are clearly not related to the CPU/APU.