bisecting brought me to commit
288d5abec8314ae50fe6692f324b0444acae8486. Reverting seems to work as
microcode is loaded with compiled in firmware and radeon kms driver.
That's
commit 288d5abec8314ae50fe6692f324b0444acae8486
Author: Linus Torvalds <torvalds at linux-foundation.org>
Date: Wed Aug 3 22:03:29 2011 -1000
Boot up with usermodehelper disabled
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