Try typing the following command in a terminal:
xgamma -gamma 0.75
If that doesn't work you need to install xgamma from the repos.
I have posted my own solution here on setting it up:
http://ubuntuforums.org/showthread.php?p=4168042#post4168042
Try typing the following command in a terminal:
xgamma -gamma 0.75
If that doesn't work you need to install xgamma from the repos.
I have posted my own solution here on setting it up:
http:// ubuntuforums. org/showthread. php?p=4168042# post4168042