**System Information**
OS X El Capitan / Windows 10 (tested on both)
MAC: AMD Radeon R9 M295X 4096 MB / WIN: MSI Geforce 980
**Blender Version**
Broken: 2.77 RC1 and newer buildbot version
Worked: ?
**Short description of error**
Flat/strange shading on smooth objects
**Exact steps for others to reproduce the error**
1. Switch to Cycles Render
2. Empty Scene
3. World Background Use Nodes -> Color to Black
4. Add UV Sphere -> then set to smooth shading (Tools -> Shading -> Smooth)
5. Add Sun Lamp -> then rotate around X 20-70 ° for better viewing
6. Switch to Rendered Viewport
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