2 ms·
> 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 sen
by duskwuff 3y ago
> 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.