Created attachment 468447 [details]
Picture of screen
Booting the rawhide kernel on an 11" Macbook Air (the late 2010 version) gives a screen as shown in the attached jpeg. On X startup, the screen goes black.
Created attachment 468448 [details]
/var/log/messages for the machine
02:00.0 VGA compatible controller: nVidia Corporation Device 08a2 (rev a2)
Plenty of lines like
Dec 13 13:06:57 macbookair kernel: [ 14.312659] [drm] nouveau 0000:02:00.0: PFIFO_BAR_FAULT - VM: Trapped write at 0001018950 status 01040b06 channel 0 (0x00000040)
I am calling this duplicate of bug 650949.
*** This bug has been marked as a duplicate of bug 650949 ***