System Information
elementaryOS 0.3.2, GTX 970
Blender Version
Broken: (example: 2.77 a91a49b)
Worked: (2.77)
Short description of error
The AO pass in cycles only works when AO is enabled for rendering. It used to be possible to render out an AO pass without actually using AO for render.
Exact steps for others to reproduce the error
Open this file and render. No AO pass.