Bug: Levels are much darker than they should be for some iGPUs

[craftablescience]

Describe the bug

NOTE: Before you ask, I have set the brightness to max on both games. I hate not being able to see.

A picture is worth a few words.

Portal 2:

P2CE:

Portal 2:

P2CE:

To Reproduce

1. Open any map in Portal 2
2. Open any map in P2CE
3. P2CE is visibly darker

Expected Behavior

P2CE should be as bright as Portal 2, and I shouldn't need to keep checking if I've turned my monitor brightness up.

Operating System

Reported on Windows 10, with an Intel CPU and iGPU.

Notes

• Coco provided assistance in the Discord, but nothing was working. We tried mat_monitorgamma and mat_monitorgamma_tv_enabled, to no avail.
• Lighting seems to be fine for all NVIDIA GPUs

[FrozenDragon0]

Can confirm that NVIDIA GPU's are unaffected by this problem:

Running a GTX 1660 TI OC.

[JJL772]

It almost looks like you have r_shader_srgb 1 enabled.

This is what my game looks like with r_shader_srgb 1

And this is normal, without srgb

[craftablescience]

It was off to begin with ;-;

[JJL772]

This can be fixed with mat_tonemapping_occlusion_use_stencil 1. Usually this is set by dxsupport, but it doesn't have all GPUs.

[ashifolfi]

I thought I was just going insane and Mandela effecting myself but no apparently it really was darker than normal good to know.