Linux Mint 14.1 Cinnamon disable screen saver

[ejihwan]

I tried to disable at brightness and lock,
But I can't disable it.

Here is my brightness and lock setting

Brightness to max
uncheck "Dim screen to savepower"
Turn screen off when inactive for "never"
Lock off
check require my password when waking from suspend

And "Power" setting

Suspend when inactive for "Don't suspend" both
When the lid is closed "Do nothing" both.

What did I wrong?
Any idea?

Thank you.