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a60fb26
(Get the code!)
Adam, there code that decides the resolution is different with KMS (it is in the kernel) than with UMS (nomodeset, it is in the -intel driver). There have been a number of problems with this, and many have been solved in the new kernel (2.6.32). But let's focus on the freezes here.
On some similar freezes on i855 it was suggested to use xorg-edgers and an option to flush the debug cache in order to get better batchbuffer dumps. See bug 447892, comment 23. Unlike Albert Damen I do not know how to read batchbuffer dumps, but I can imagine that it would be easier for the developers to make sense of it with that option on.