Comment # 1 on bug 1200539 from Takashi Iwai

Please boot with nomodeset, and make the system running.  Then run hwinfo and
attach the output to Bugzilla (don't paste).

And we need to check what's going on without nomodeset; please try to boot
without nomodeset, but additionally with drm.debug=0x1e log_buf_len=16M
options, and confirm that you get no proper screen.  Reboot with ctrl-alt-del
(you might need to press multiple times quickly) but with nomodeset again. 
Then get the previous boot log (e.g. the output of "journalctl -k -b-1"). 
Compress the kernel log and attach to Bugzilla.