Created attachment 122792 [details]
Screenshot of the corruption

When the screen fade-out when i want to disconnect from kde, the screen is
corrupted. This problem wasn't here when it was with a Pitcairn card (HD7870),
the problem is with a Tonga card (R9 380 2gb).

* mesa from git
* llvm from svn
* xf86-video-amdgpu 1.1.0 (same with 1.0.1 or modesetting driver)
* xorg-server 1.18.3 
* kernel 4.6_rc2 (same with 4.4 and 4.5)

Afaik it is not a regression, i have this problem since january when i bought
the card.