[Poyeyo]

In my case I had a very dark CRT monitor.

Likely burned out after many years of use.

This is the tool I made to make it brighter:

https://github.com/macondobits/gamma

It resides in the system tray, remembers profiles, and it could be useful for someone else.

I will upload the gamma.exe file to github one of these days, or sooner, if anyone wants it.

The great and unexpected thing, it even works in Wine and changes the gamma ramp in Ubuntu. I use xgamma in the command line instead of my own tool, but I'm glad it works.