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No sound on headphones attached to front panel
In Debian Stretch the auto-mute function is not working as expected. In case there's no sound on headphones attached to the front panel of a linux machine, disable auto-mute as follows:
Run the command alsamixer in the terminal
- Press "F6"
- Select the on-board sound card named "0 HDA Intel PCH"
- With the arrow (cursor) keys move to the slider labelled "Auto-Mute"
- Disable auto-mute by pressing the "arrow down" key
- Plug-in your headphones
- Make sure the sliders "Master" and "Headphone" are unmuted by pressing "m"
- Set the volume of the sliders "Master" and "Headphone" with the arrow up/down keys according to your needs