[Bug 76490] No output after radeon module is loaded (R9 270X)

https://bugs.freedesktop.org/show_bug.cgi?id=76490

--- Comment #1 from Gustavo Lopes mail@geleia.net --- When it hangs (which always happen if I don't have X already started), I sometimes get a bunch vertical white and black stripes. dmesg doesn't show anything interesting, just

[ 278.575937] fbcon: radeondrmfb (fb0) is primary device [ 278.590490] Console: switching to colour frame buffer device 240x67 [ 278.602467] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device [ 278.602531] radeon 0000:01:00.0: registered panic notifier [ 278.606539] [drm] Initialized radeon 2.37.0 20080528 for 0000:01:00.0 on minor 0