Alexander Hoogerhuis [off-list ref] wrote:

I'm not suspecting the PCI in particular for the PCIC-bits, only
making X and the Radeon work again. But here you are:

Something bad has happened to the Radeon driver in recent kernels.  I've seen
various reports with various syptoms and some suspicion has been directed at
the AGP changes.

But as far as I know nobody has actually got down and done the binary search
to find out exactly when it started happening.

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