I'm using an HP laptop with an external screen connected through an HDMI cable, and the lid closed.

Every time I lock the screen, it dims and then cuts signal to the screen, leaving it in a blue screen that says "No Signal", and eventually it just turns off.

I want to be able to lock my screen and walk away from the computer WITHOUT having the external screen turn off.

I have gone into Settings and unchecked "Dim screen to save power" and set "Turn screen off when inactive" to "Never"

I have run xset -dpms

I have gone into dconf-editor and set com->canonical->unity-greeter->idle-timeout to 0

Nothing works.

No matter what I do, when I lock the screen (or it auto-locks), it dims and then turns off.


I use xscreensaver instead of gnome-screensaver.

sudo apt-get remove gnome-screensaver

sudo apt-get install xscreensaver

Configure xscreensaver :

Lock screen

Those instructions are from here : Configure screensaver in Ubuntu

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  • If your answer is essentially a referral to another question, it would be better to flag this question as a duplicate of the other once you earned 15 reputation. Don't forget to vote for the answer(s) there that you found useful! – David Foerster Nov 26 '16 at 11:22

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