Win 10, Core i5 12gb ddr3, AMD Firepro W9100 16Gb GDDR5
All Blender versions tried for last 4-5 months, Even Master
Short description of error
The bake process appears to be doing something in the background, The bake commences as should, takes the amount of time needed to compile kernels, renders in the time you would expect from gpu but when complete the output is always Black, On very type of bake mode, Color, Complete etc etc
Exact steps for others to reproduce the error
Just try to render with opencl gpu for bake.
I can give the file which has a complex material on to help test, but i cant post it publicly. Just tried a new build from blender.org and basic baking now works, flat plane with just diffuse shader, but with my scene the only thing that bakes is AO