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A comment on “Just turn it off” and Airplane Mode. Parent comment

Re:“Just turn it off” and Airplane Mode by duskwuff on Sunday June 18, 2023 @10:32PM (#36386697)
> I still don't entirely understand how HDMI/CEC knows what my monitor is. It feels like the monitor is powered off, does the chipset respond to the voltage sent "up" the HDMI lead?

Yes. The HDMI source provides 5V over pin 18.

The same mechanism is also used in VGA and DVI.

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