On 25.11.2014 12:21, Herminio Hernandez, Jr. wrote:
[ 1.968242] radeonfb (0000:00:10.0): ATI Radeon 4e50 "NP"
radeonfb is still enabled. You need to disable it with video=radeonfb:off to allow radeon KMS to initialize.
The black screen is probably a login manager (gdm3?) bug: radeonfb and by extension the Xorg fbdev driver default to depth 8, and the login manager probably can't deal with that correctly.
-- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer