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0e1f616
(Get the code!)
The problem is fixed for me with 2.6.31-2.15, X is fast as usual again. One can read in the changelog that radeon KMS was disabled in this version.
I wonder why this affected me anyway, I have a R600 series chip which is not supposed to get KMS just yet at all. The now committed KMS is only up to R500 as far as I know.