Greg, I suspect that this bug is actually several related ones, as for my system it does seem to have been fixed upstream. I would also not be surprised if it is due to (various cases of) quirky hardware which was deemed to work because it tested successfully under Windows. It might be worth your while though going upstream (e.g. to the kernel bugzilla) with this, as you are more likely to get the people who really understand this stuff (no offence to Canonical and their kernel engineers - no one can understand more than a small cross section of the kernel code).
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