Created attachment 106788 [details]
GTT and VRAM usage shown by GALLIUM_HUD

VRAM and GTT usage steady increases when using desktop in wallpaper slideshow mode. It doesn't happen directly after starting plasmashell, but I can trigger it in under 60 seconds.

What I do:
1. Reset my plasma config
    mv ~/.config/plasma-org.kde.plasma.desktop-appletsrc ~
2. Run plasmashell (in my case with GALLIUM_HUD to see VRAM and GTT info)
    GALLIUM_HUD="requested-VRAM,requested-GTT,VRAM-usage,GTT-usage" plasmashell
3. Set desktop to slideshow, configure a folder with tons of images and 
   keep change interval at 1 second.
(4. Bring up some other plasma surfaces which maybe triggers a race condition.)

What I see:
VRAM usage is increasing with every image up to a point where radeon driver says "no" with "radeon 0000:23:00.0: va above limit (0x00200407 >= 0x00200000)".

My system:
Linux stan 4.11.9-1-ARCH #1 SMP PREEMPT Wed Jul 5 18:23:08 CEST 2017 x86_64 GNU/Linux
OpenGL core profile version string: 4.5 (Core Profile) Mesa 17.1.5