Windows 7 x64 Ultimate
AMD Radeon HD4870X2
Broken: later test-builds, RC1, RC2
Worked: one of the first test-builds for 2.76
Short description of error
Unable to select any OpenSubdiv compute device (neither GPU nor CPU) even though it was possible to select one in early test-builds.
Exact steps for others to reproduce the error
Nothing special, just open Blender, go to user preferences->System, and cannot select any device.