#StackBounty: #gnome #laptop #screen How to make a second monitor go off after the connected laptop is closed?

Bounty: 50

I use Ubuntu 18.04.3 gnome laptop with a second monitor connected with HDMI. If I close the lid of my laptop it successfully locks (after I reopen it I have to type my password) but the windows opened on my second screen stay in place. I mean they can be seen after the lid is closed. I want them to go away in that situation (the second screen must go black), how do I do that?

Get this bounty!!!

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