https://bugzilla.kernel.org/show_bug.cgi?id=83731
--- Comment #3 from Giancarlo Formicuccia giancarlo.formicuccia@gmail.com --- No runpm=0 doesn't help.
I read from your comments on 6c7bccea390853bdec5b76fe31fc50f3b36f75d5 that the initialization order changed, and it's possibly related to my problem.
FWIW, (last time I checked, more than one year ago), fglrx seems to have a similar 'Unknown header type 7f' issue on this GPU. My bugreport on ATI bugzilla is here: http://ati.cchtml.com/show_bug.cgi?id=743