TV does not appear as audio source?

I connected my laptop to my TV via HDMI.

However, I don't get any sound. What can that be?

HDMI only transmits the picture.

edit: wrong, habs confused with DVI.

HDMI is not set as the output signal on the TV.

Deactivated in the past and deactivated devices.

Maybe your TV has no speakers or you have used a connection that only transmits video.

How can you adjust it?

Nope

You may need to realize that a TV is not an audio source.
This would clear up an important misunderstanding.

The television is not a source, it is the playback device.