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When connecting my 14.04 Ubuntu laptop with HDMI to my TV, the image is turned off after a few minutes, even when connected to the power. I then move the mouse and the image returns.

How can I prevent the monitor from turning off?
Notice the laptop does not go into sleep mode, just turns off the monitor

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When inactive, Ubuntu turns off the screen after a while. To change this, open Settings > Brightness & Lock and change the Turn screen off when inactive to Never

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