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1b1ed1a
(Get the code!)
I had this problem with my 6850 card. Same problem continues with the rx460 which uses newer amdgpu driver. Unfortunately this driver doesn't have the "EXAPixmaps" option. But I found another option that seems to help the situation: "ShadowPrimary". Here is the Xorg configuration file I used:
Section "Device"
Identifier "AMDgpu"
Driver "amdgpu"
Option "ShadowPrimary"
EndSection
Disclaimer from man page of amdgpu: This may improve performance for some 2D workloads, potentially at the expense of other (e.g. 3D, video) workloads.