this post was submitted on 20 Mar 2024
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Look into HDMI-CEC, it does exactly what you are looking for. Unless you are using a very old screen, it should work (the screen has to support it).
I'm just using a Dell PC monitor (21" 1080p) from like 2010. It supports HDMI but I don't know about CEC. Either way it could just put the monitor to sleep and that would be fine, doesn't require CEC. I just am not sure of a way to trigger this manually when I'm done using it.
No offense, but I can't help but picture Michael Scott's wall mounted TV when reading about your 21" monitor as a bedroom TV.