**System Information**
Windows 10 64bits, Nvidia GTX 670
**Blender Version**
Broken: Blender 2.77 Release Candidate b594b25
Worked: 2.76
**Short description of error**
Emission material not working
**Exact steps for others to reproduce the error**
The lighting comes from HDRI environment map.
Emission material doesn't work in CPU nor GPU.
{F286547} Screenshot of the viewport and basic settings, render mode
{F286549} Blend file