Debian amd64, Radeon HD with fglrx
Broken: current GIT, also many previous versions were affected in case of BI Baking
Short description of error
Dithering is not applied for Texture Baking, resulting in banding artefacts.
Cycles Baking and BI Baking are affected.
Also when saving a 32 bit float image as 8 bit PNG, no dithering is applied (despite Dithering was set to 1.0, and "Save as Render" was activated).
Exact steps for others to reproduce the error
A .blend file is attached. Click on "Bake" and wait a few seconds. After baking is finished you should see the banding artefacts in the dark-gray regions.