Christopher, I have just tested the latest mainline kernel, that is v4.0 from 
13-Apr-2015. Exactly the sme behaviour as
v4.0-rc7. I note from the boot log that when KMS is enabled usbcore is 
registering drivers usbhid and uas, then the framebuffer
is switched from EFI VGA to radeondrmfb after which there are no more messages 
and the boot stalls.

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Title:
  Keyboard does not respond/scrambled video

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