https://bugs.freedesktop.org/show_bug.cgi?id=29389
--- Comment #6 from pj_beers@hotmail.com 2010-10-24 14:40:13 PDT --- I reported the same bug (I think) over here:
https://bugzilla.kernel.org/show_bug.cgi?id=20042
Your latest patch disabling polling DACs works for my, I applied it to 2.6.36-rc7 and then ran Penumbra Overture without any problem. I'm using rv380, not rv370 (according to dmesg). I've included dmesg output as an attachment.
Thanks very much for this patch!