Comment # 3 on bug 100068 from Hleb Valoshka

(In reply to Wojciech Pyczak from comment #2)
> Created attachment 130081 [details]
> Unigine Heaven output
> 
> Looks like it's not all, glxgears works fine though.

Looks like Marek has found a correct solution:

https://lists.freedesktop.org/archives/mesa-dev/2017-March/146693.html