https://bugzilla.kernel.org/show_bug.cgi?id=37442
--- Comment #5 from Michel Dänzer michel@daenzer.net 2011-06-15 07:59:16 --- Dave, the implicated commit doesn't seem to hook up drm_pci_irq_by_busid anywhere. That's probably not intended? :) Not sure why the compiler doesn't complain about it...
Not sure that can explain anything with KMS enabled though... Wolfram, does reverting just this commit fix things with KMS enabled as well?