Hi, i can't change gamma and brightness on my pc, i tried almost every software including windows calibration tool, but results are always the same. Brightness change for 2 seconds and then resets to default settings. I have geforce 260gtx with latest drivers.
You should be able to change the gamma using your monitor rather than software.
What is the make/model of your monitor?
I have the same exact problem, and I don't have gamma correction options on my monitor. And even if I did, I'd like a fix to the problem, not a work around. There should be a way to freaking fix this. It's so frustrating.
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