Dell Inspiron desktop, when I plug headphones into the front-panel jack, the headphones work, but it does not mute the speakers which are plugged into the back-panel. Instead, the speaker volume reduces by about half, but still clearly audible.
This behavior started some months back. Can’t say exactly when, because I don’t often use the headphones. It definitely used to work.
Not hardware related, since it works perfectly on Windows-10 on the same machine (dual-boot).
Where to look?