Tuno
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Short answer

Monitors and TVs connected over HDMI or DisplayPort don’t accept volume commands from macOS, so the volume keys show a “not supported” sign. Tuno adds software volume for these devices and makes the keyboard volume keys work again.

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In macOS

macOS passes the sound to the monitor at full level and leaves volume to the monitor’s own buttons or remote. There’s no setting to turn this on.

With Tuno

  1. 1

    Open Tuno and allow “System Audio Recording”.

  2. 2

    Choose the monitor as the output in the Tuno menu. The volume slider now works and shows “Software”.

  3. 3

    In Tuno › Keyboard Shortcuts, turn on “Use volume keys for software volume” and allow Accessibility.

  4. 4

    The volume and mute keys now control the monitor; ⌥⇧ with the keys gives finer steps.

Download for MacMore about App Volumes ›

macOS 15 or later, Mac with Apple silicon.

Frequently asked questions

Why can’t my Mac change HDMI volume?

HDMI and DisplayPort audio has no volume control that macOS can talk to. The level has to be changed before the sound is sent, which is what Tuno does.

Does it work with TVs and USB-C monitors?

Yes. It works with any output device that has no volume control of its own, including TVs, monitors and many USB-C docks.

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