https://bugs.freedesktop.org/show_bug.cgi?id=77677
--- Comment #21 from Peter Frühberger fritsch@xbmc.org --- As a workaround, use xbmc and whenever you upscale a video, choose Lanczos3 Optimized as Scaling algorithm. That should put a whole lot of pressure onto the GPU.
Make sure to not use that one to "upscacle" 1080 to 1080, cause that will kill performance.