https://bugs.freedesktop.org/show_bug.cgi?id=70934
--- Comment #9 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #0)
I've switched from openSUSE's 3.4.47 to drm-next-3.13-wip and noticed problems with colors. Gradients are not smooth, it looks like the GPU is working in some limited color depth (lower than 24b).
I suspect you are seeing a problem with these patches: http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-3.13-wip&id=... http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-3.13-wip&id=...
You might try enabling dithering via xrandr.