Question about linux and AMD based chipsets/onboard raid

[James Crawford]

Question,
    Is the video one of the older/non supported AMD chipsets (HD 4000 
and older)?
    Are you using Catalyst driver?

If yes to both then see 
http://www.unixmen.com/ubuntu-12-10-and-amd-catalyst-problem-solved/

It sounds like this may be what you are running into.


James C.