Lubuntu 14.04
The following all results in a black screen:

video=ofonly
video=radeonfb:off
video=radeonfb:off radeon.modeset=1
video=radeonfb:off radeon.modeset=1 radeon.agpmode=-1

I can usually reboot by blindly pressing ctrl+alt+f1 ctrl+alt+del
ctrl+alt+del sot it is not frozen, but no console ever apperas.

I have also tried compiling the kernel with radeonfb as a module but
this didn't help either, it just made xorg not work (console did).

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https://bugs.launchpad.net/bugs/1058641

Title:
  "No devices detected" radeon regression

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