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I'm trying to turn the monitor off via my RPI, which works well using either

vcgencmd display_power 0

Or

tvservice --off

But then, with both of them, it shows a default message saying something like "Cable not connected". Is there any way to block it or hide it or use any other command that might not end up in the same result?

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Yes, if your monitor supports HDMI CEC commands. Try installing cec-client and running

echo "standby 0" | cec-client -s

to see if it does.

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    Unfortunately it doesn't. Also running echo 'scan' | cec-client -s -d 1 doesn't show my monitor. Thanks for the suggestion though... – muilpp Dec 13 '19 at 12:38

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