Comment # 9 on bug 100058 from Michel Dänzer

(In reply to Adam Wolk from comment #7)
> 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.

It can't really be directly related, since the display isn't connected to the
AMD GPU. I'd report it against the i915 kernel driver.