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I would like to plug a mouse and keyboard into a monitor and have the HDMI cable carry the signal back to the laptop along with the video. Do HDMI cables an ports support this functionality?

The laptop—an Acer Aspire V5-571P-6828 running Windows 10—has an HDMI port but no other video ports, so a DisplayPort is not an option.

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    I'm curious too because amzn.to/3mfnkbv sure seems like there are special HDMI cables that handle USB and mic/speaker too. See section "How to Get Keyboard and Mouse Work" (sic).
    – Ryan
    Oct 23 '20 at 13:18
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No, HDMI cables don't support this functionality.

HDMI does have a backchannel (CEC) which in principle could be used to carry mouse and keyboard signals, but I don't know of any hardware which actually uses it for that. You may be able to use it that way in hardware you built yourself, but it's extremely unlikely your monitor supports it.

Monitors sometimes have an integrated USB hub for mouse and keyboard, and require an USB cable back to the computers.

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If you can plug your USB mouse & KB into your monitor, it has a USB hub built in. If so, you should connect Your PC to your monitor with a USB A-B cable in addition to the existing HDMI connection.

While Display Port seems to carry all kinds of signals, HDMI is limited to AV only.

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    "HDMI is limited to AV only" - that's not true. It can carry reverse audio, ethernet and media control signals as well.
    – gronostaj
    Dec 11 '16 at 22:30
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    Why mention a monitor with a USB hub if the monitor hub itself is connected is connected to the PC by a USB cable? This seems like sort of a non-helpful piece of information. Besides, "HDMI is limited to AV only.", isn't even true.
    – Ramhound
    Dec 11 '16 at 22:30

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