Well, a couple of Fedoras back, X didn't work except with
radeonhd, but now
radeon appears to support this one as well; I switched to it, and the CPU
issue is gone even with KMS. Now fonts (esp small ones) look very smudgy
though. But I suppose there are already bug(s) open on this.
Don't suppose. Either search Bugzilla to see if that's the case, or
report it anyway.
If one keeps supposing the bug was already reported, it might never get fixed.
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Mathieu Bridon (bochecha)