https://bugs.freedesktop.org/show_bug.cgi?id=57567
--- Comment #53 from Alexandre Demers alexandre.f.demers@gmail.com --- (In reply to comment #51)
(In reply to comment #49)
Alex, is this expected for the workaround?
No. So it appears turning off the displays doesn't help either :/
Well, it does help: the screen switches from GRUB to kernel correctly set (displaying the console), then the screen flashes for a moment (one white flash instead of one blue flash when the reported bug happens), comes back to normal in console (where there is now the AMD-Vi IO PAGE FAULT messages) and continues to work even after Xorg is started.
A difference between Vladimir and I is we don't have the same video card (6950 over here).