https://bugs.freedesktop.org/show_bug.cgi?id=66963
--- Comment #105 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #104)
with
linux /boot/<blah blah blah> radeon.modeset=0 1
it seems it's booting but I can't see command line - only black screen or text line: "kernel booting... bla-bla-bla" and also no command line. Trying to enter anything gives nothing. But if a enter "reboot" and press Enter it restarts. So it gets the commands but I can't see any display output.
can you blindly type: modprobe -r radeon modprobe radeon modeset=1 dpm=1 dmesg > dmesg.log reboot