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CEC over HDMI control? (lemmy.ca)
submitted 23 hours ago* (last edited 21 hours ago) by to c/linux@lemmy.world
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So I’ve got a living room computer running Cachy OS/Plasma Bigscreen that has replaced my Xbox. (I’m calling it the Xbox None)

It’s an old Dell Optiplex I picked up for cheap - runs indie titles pretty well and I can stream from my main PC.

Anyway, that’s not why I’m posting..

I can’t seem to find a way to get it to turn the TV on and off when it goes to sleep and wake up. Can anyone help?

Edit: thanks for the answers! I don’t want to buy an adapter so I guess I’ll live with having to use the remote. 🤷‍♂️ I am going to see if the TV settings can help me out though.

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[–] 9 points 23 hours ago (3 children)

It is rare that a computer have HDMI-CEC natively.
Try the command "cec-ctl" (which is part of v4l-utils) or take a look at the Arch Wiki.

Even if your hardware doesn't support it, you can still use displayport with an adapter or even a usb+hdmi adapter.

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  • [–] [S] 1 point 21 hours ago* (2 children)

    Ohhhh, I do have a display port and a display port to HDMI adapter already. Would this work or would the TV need display port too?

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  • [–] 4 points 21 hours ago* (last edited 21 hours ago) (1 child)

    The TV will be connected with HDMI and computer will have its DisplayPort converted to HDMI by a supported adapter. But:

    most adapters do not support the CEC Tunneling feature, and of those that do many did not actually connect the CEC pin. Unfortunately, this means that while a CEC device is created, it is actually all alone in the world and will never be able to see other CEC devices.

    DisplayPort to HDMI Adapters with working CEC

    HDMI-CEC Tunneling over DisplayPort | Arch Wiki

    TL;DR

    Connect your computer's DisplayPort with DP-HDMI adapter to TV's HDMI. To test if the adapter tunnels CEC, run in a terminal:

    cec-ctl --playback && cec-ctl -S

    Which should show at least two devices.

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