No sound on LG display via USB - C

I just got a LG 27UD88 display to a MacBook. The monitor supports USB - C and claims to support audio over USB - C. The MacBook is connected only via the USB - C cable.

  • Powered MacBook & recharge?
  • Video work?
  • Display USB hub work?
  • Audio through speakers display?

The MacBook certainly sees the LG monitor as an audio output device. System Preferences > Sound > result lists both options

  • Internal (built-in) speakers
  • LG Ultra HD (DisplayPort)

When the LG is selected, however, there is no audio. Volume level on the screen is up.

Any suggestions?

Could check you if the monitor has speakers built in? I saw this monitor, too, but I think that it has only a 5mm 3 speaker, (which could refer to the "internal speaker" option).

Tags: Notebooks

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