Ever since I've updated to Mountain Lion, the screen brightness keeps changing automatically. I don't have the setting enabled in Energy Saver.
I usually have my brightness set to 100%, and the system sometimes changes it to 80% (e.g. when I wake my Mac from sleep). If I live it at 80%, it changes it to 60% ... and so on. This is really annoying.
pmset -g results are:
Active Profiles: Battery Power -1* AC Power -1 Currently in use: standbydelay 4200 standby 0 halfdim 0 sms 0 hibernatefile /var/vm/sleepimage disksleep 0 sleep 0 hibernatemode 0 ttyskeepawake 0 displaysleep 10 acwake 0 lidwake 1