I've built a new package that drops our two dithering patches, and
includes the dithering rework up to commit 435cf7da.  I decided to omit
the rename patch since it was pretty large and didn't seem to bear on
the problem.

The patch built, installed, and ran fine; I found no regressions on the 
hardware used for #17094, and the upstream changes fixes the original issue as 
well as my patches had.  I did not find it completely eliminated banding 
though; but it looks no 
worse than before.

I've reviewed the patch in depth.  The patch is unfortunately pretty
lengthy for SRU purposes, but I don't see a way to simplify it further
while retaining the fixes it provides.

-- 
Properly fix dithering problems
https://bugs.launchpad.net/bugs/284346
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