https://bugs.freedesktop.org/show_bug.cgi?id=73530
--- Comment #21 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #20)
I guess I spoke too soon. :( Now starting the system a second time, the display is black again with the backlight enabled. I was able to login blindly into GNOME using GDM, so X is running. I’ll post the log files. Hopefully something can be spotted.
Make sure you booted the correct kernel.