Line-in is not recognized?

I built a 2nd PC to run YT / Netflix while e.g. Play on my main PC. Now I need a cable that transmits audio etc. I used a normal Line IN / Out cable for this.

Unfortunately nothing arrives in the system control:

"In 1-2" sounds like the only correct device to me.

Go to the settings there and make sure that everything is selected correctly and that the level is not at 0.

Reinstalling the sound card driver can also help.

Works meanwhile. 1/2 is my interface (Motu M2). I uninstalled all drivers

Since you did not write anything about an interface in your question, you could not be helped in that regard. No wonder.

It's nice that the problem is fixed.

The inteface has nothing to do with it… The entrance was not recognized