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35a32c5
(Get the code!)
I'm having this problem as well. It seems to almost be confined to the i915 chipset. I began noticing the error when I first installed ubuntu a few weeks ago. It didn't affect the performance at all, just a warning I saw on shutdown. This was on 3.0.12-generic (I can give you more specifics if I can get to my server which is at home and internet is down.). Same thing for 3.0.13-generic. Works, but there's that same error message.
When I updated to the latest ubuntu kernel (3.0.15-generic) I get the exact same errors and my system seems to keep restarting X. I have no available shells on Alt-F1, etc, just repeated error message that seems to peg the CPU. When the system did finally get stable (after 5 minutes or so) it was so sluggish as to be unusable. The CPU was probably pegged, but with no shell access I can't say for certain.
HTH. I'll provide more if needed. I'll try the echo command and see if it helps tonight.