When you’re seeing films or reading ebook on your ubuntu,the display will turning off with no action in a period of time.There is a way to configure this setting.

Open up power management by clicking on System–>Preferences–>power Management.

At following screen,move the slider to the right.


If you have a screensaver active,navigate to System–>Preferences–>Screensaver and uncheck the two checkboxes at bottom.