I got this problem too.
I've a core duo mac mini (so, intel GMA 950).
I haven't seen anything in the X log.
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lockup on mac mini 945GM [8086:27a2]
https://bugs.launchpad.net/bugs/218334
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Same problem.
When amarok (using xine) plays something, Flash (plugin nonfree) is unable to
play a video from youtube.
The youtube player stops after about 2 seconds of video with no sound.
When Firefox plays a youtube video, amarok is unable to play anything
(Audio output unavailable; the devic