Comment # 7 on bug 100058 from Adam Wolk

Regarding the display flicking on/off (the effect feels like changing
resolution - the way it goes out and back). This is completely mitigated by
running DRI_PRIME=1 glxgears hence why I thought it might be AMD driver
related.

Regardless, the main thing reported here is a null pointer dereference in the
kernel and a system unable to boot completely.

I can live with the flicker - I just workaround it by running DRI_PRIME=1
glxgears all day...