Left 4 Dead 2 renders much too dark on Intel
It's so dark in places that it's basically unplayable.
Here's how it looks on NVIDIA with closed-source drivers:
Here's how it looks on Ice Lake with Iris:
Both images are "Survival Mode" in the Dark Carnival map Concert. I also tried i965, and I got the same results. I have not tried other Mesa drivers.
Also possibly interesting... in the "Brightness" setting in from the Video menu had no effect on Intel, but it had some minor effect on NVIDIA.