First you need to know what the highest possible resolution for you monitor is.
If you dont know already, go system control -> display -> resolution.
Now move into your Call of Duty directory, enter main folder and open config_mp.cfg with any texteditor (config_mp.cfg is for multiplayer, config.cfg is for singleplayer)
Now lookup for those three entries:
seta r_customheight "y" <- Put in your resolutions y-axis
seta r_customwidth "x" <- Put in your resolutions x-axis
seta r_mode "-1" <- Put in -1 (it is needed for custom resolutions)
So for example if your monitor and graphic card supports full hd, fill in:
seta r_customheight "1080"
seta r_customwidth "1920"
seta r_mode "-1"
Save it, close it, start game and it is done.
Many Windows Vista and 7 users got problems with the brightness setting. If you set r_gamma to values higher than 1.0, or move the brightness controller to the right it just stucks or the screen even turns darker. But that issue is quite easy to fix.
Follow these steps:
1. Right-click CODMP.exe
2. Click Properties
3. Open "Compatibility" tab
4. Check "Run this program in compatibility mode for"
5. Click the box and select "Windows XP (Service Pack 3)"
6. Press APPLY
You should now be able to change the brightness in the game again. You should also be able to change your resolution again back to your used one.
I didn't had this issue (well yeah i did, but the gamma/brightness was fine for me) but people who asked for my config pmd me afterwards and said: "yo how can I change gamma/brightness" i was like yo idk man.
I knew there was a command, i found it, the command was something like: r_ignorehwgamma, defualt its set on 0, but I had it on 1 so people couldn't change the gamma.
Try to put this command: r_ignorehwgamma 0 and change map and change gamma, should work then i believe.