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I was wondering if it was possible to power on/off a display using a computer connected via HDMI. Let me explain :
I want my computer to power off my monitors (not standby mode) when I don't use it (no keyboard/mouse input) for more than 15 minutes, and power them back when such input is received. My monitors are connected over HDMI, so I was wondering if it was possible to use the CEC functionality with a computer. If is it possible, then is there a hardware requirement ?
My point is that I often take a break from my computer, but forget to turn off the screens, and I would prefer to shut down the screens completely instead of putting them to standy mode
Thanks a lot
I think cec-client is probably what you were looking for: https://stackoverflow.com/questions/15315372/sending-cec-commands-via-command-line-over-hdmi
– A.Danischewski – 2019-10-28T15:18:06.78017What's wrong with leaving them in Standby mode? It's very low-power usage. If the display truly is off, then you won't be able to wake it remotely (as it will be off, and can't respond to anything). – Ƭᴇcʜιᴇ007 – 2013-09-22T17:42:51.177
3True -- and to get... well, technical... even when a device is fully "off" it's still "on" in that it's waiting for the power button to be pressed... – Matt – 2013-09-23T04:20:03.637
2@Matt That depends on how the power button is wired. If it's wired to actutate a contactor, relay or something else along those lines (electronic or electromechanical power switch; electronic power switches are commonly used for electronic equipment these days) then what you are saying is true: "off" is still a sort of "standby" mode. If it is electrical or mechanical (usually wired in-line with the mains power), like the power switch on old AT PSUs and the back of ATX PSUs as well as lots of home appliances, then turning off power with the power button actually turns power off. – a CVn – 2013-09-23T07:16:20.990
4There are desktops which have a power outlet for monitors. I used to have one and the main advantage is that the screens are turned of when the desktop is. I'm not sure if the power outlet is reachable via some script. – BlueCacti – 2013-09-23T09:07:57.397
1I plug all my monitors into one power strip, with the power switch sticking out from under one of the monitors. This allows me to flip a single switch to turn them all off/on. – MichaelHouse – 2013-09-23T13:24:48.617