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DisplayPort - Wikipedia
https://en.wikipedia.org/wiki/DisplayPort#:~:text=DisplayPort%20can%20be%20used%20to%20transmit%20audio%20and,channels%20of%2024-bit%2C%20192%20kHz%20uncompressed%20PCM%20audio.
No Sound with DisplayPort or HDMI Video Cable …
https://www.dell.com/support/kbdoc/en-us/000125484/no-sound-with-displayport-or-hdmi-video-cable-connection
Under choose your output device, select the audio device that you want to use. To change the default sound playback device in Windows 8 or 8.1. Right-click Start, and then click Control Panel. Click Hardware and Sound. Click Sound. In the Playback tab, select the audio device that you want to use. Click Set Default, and then click OK.
Windows 10: No sound with DisplayPort - Microsoft Community
https://answers.microsoft.com/en-us/windows/forum/all/windows-10-no-sound-with-displayport/77d57d87-096d-441c-8f7e-ca34c45c610c
Connected to the NUC is a monitor with built-in speakers, the cable is a DisplayPort cable. With Windows 8.1, there were no sound problems. The device manager of Windows 10 shows two devices under "Sound, video and game controllers" - Intel Display Audio and Realtek High Definition Audio, but no errors.
DisplayPort Fixing Sound "Not Working" Problem [SOLVED]
https://multimonitorcomputer.com/solved/displayport-fixing-sound-not-working-problem.php
STEP 2: How To Select The Audio Playback Device. Now, you can select the DEFAULT AUDIO OUTPUT DEVICE for your computer. To do that, RIGHT-CLICK on the device you wish to use as default (in this case, "SPEAKERS"), then select "SET AS DEFAULT DEVICE". Click "OK" or "APPLY" to save your choice. You should now hear your music from your normal speakers!
DP Audio User Guide-1 - DisplayPort
https://www.displayport.org/wp-content/uploads/2011/10/DP-Audio-User-Guide-v1.pdf
Do#I#need#a#special#cable#to#use#DisplayPort#audio?# No.!!DisplayPort!audio!works!with!standard!cables.! What#is#the#difference#between#DisplayPort#audio#and#dual3mode?# DisplayPort!audio!is!“native”!audio!that!is!carried!with!the!DisplayPort!videosignal.Dual?mode!isaspecialoperating!
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