https://bugs.freedesktop.org/show_bug.cgi?id=92722
--- Comment #5 from Michel Dänzer michel@daenzer.net --- (In reply to Saurav from comment #4)
The radeon driver basically seems unable to find a screen to its liking,
(EE) RADEON(0): No modes. (EE) Screen(s) found, but none have a usable configuration.
and then gives up altogether:-
(EE) no screens found(EE)
That doesn't look related to this bug report. Please file your own report, including the corresponding dmesg output.