System Information
Debian testing, Nvidia gtx 780 + 1080ti

Blender Version
Broken: latest from master
Worked: 2.79b

Short description of error
Glass rendering on the gtx 780 card gives incorrect result. The glass shader appears very dark. 1080ti renders just fine.
When i render on both cards, i get wrong rendered buckets for 780 and correct ones for 1080ti.

Exact steps for others to reproduce the error
Open file.
Choose the 780 card or may be similar.
Hit render.