When I am inactive for 4-5 minutes, the screen is automatically dimmed. This is too much boring when I am watching movie. How to disable this thing??
Ubuntu – How to disable screen dimming in 14.04
14.04brightnessdisplay
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Best Answer
You can install Caffeine to do this:
Then search for Caffeine in your Dash to start it. It should start automatically after a reboot.
Now Caffeine will show an indicator in the top right of your screen. Click on it to enable Caffeine (your PC won't go to sleep now). Click again to disable it and Ubuntu will follow its usual sleep schema.
You can also disable the sleep permanently if you prefer.
System Settings
Brightness & Lock
Turn screen off when inactive for
selectNever