When you connect a MacBook or whatever other model of Mac to a display with an HDMI or DisplayPort, macOS has the reasonable expectation that you want to control the volume from that external device.

If you want to have your Xbox control your TV's volume, you can do it using HDMI-CEC and you can pair it with Alexa or Google Assistant. We'll show you how.

If you connect your Mac to an external display, you may find that the Mac's on-screen and keyboard volume controls are disabled. That's because HDMI, DisplayPort, and Thunderbolt connections carry ...