How to fix brighter fullscreen glitch?

[rdb]

I know this is a bit late, but I see there was never a follow-up to this thread. This looks like it is the same as an issue that was fixed last november caused by NVIDIA drivers introducing 64-bit output targets and for some reason automatically enabling gamma correction on them, which is disabled by default in Panda:

Zero multisamples in fullscreen causes washed-out look

Hello, I’m developing a 90’s style game running on 640x480 resolution fullscreen. I’m trying to disable multisamples to get a crispy, sharp look, which isn’t really achievable with antialiasing. In window it seems to work fine, but when switching to fullscreen, the screen looks washed-out. My suspicion is that an extra sRGB conversion takes place. This issue can be reproduced by using the Roaming Ralph demo. First I set the following variables to config: win-size 640 480 fullscreen #f frameb…

It was fixed in the following commit:

Work around gamma issue with 64-bit color depths on NVIDIA hardware