https://bugzilla.kernel.org/show_bug.cgi?id=73291
--- Comment #13 from Alex Deucher alexdeucher@gmail.com --- (In reply to Mike Cloaked from comment #12)
Is this bug related to https://bugzilla.kernel.org/show_bug.cgi?id=65761
I don't think so. In your case you seem to lose the display before the radeon card is even used. Are you sure radeon.runpm=0 doesn't help?