Comment # 13 on bug 83510 from Michel Dänzer

(In reply to Clément Guérin from comment #12)
> Low lighting glitch is still here. "can be seen in the Realistic Rendering
> demo or the Shooter Game demo with the Sanctuary map"

Make sure you use the current versions of the demos. I was seeing the darkness
in the first version of the Realistic Rendering demo, but it's fixed with the
current version, and Shooter Game looks fine as well.