https://bugs.freedesktop.org/show_bug.cgi?id=100058
--- Comment #9 from Michel Dänzer michel@daenzer.net --- (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.