Thinkpad X1 Carbon: Headphones not working

I am using a 6th gen Thinkpad X1 Carbon with Ubuntu 20.04. No matter which headphones I plug in, the sound is not working for all of them. They are recognized correctly in the audio settings menu als headphones, but they don't play any sound.

The laptop speakers work without any problems.

1 Answer

Try this command in a terminal:
sudo alsactl restore
If problem persists, try to manually change audio parameters in 2 ways:

• Install pavucontrol "pulseaudio volume control" with command sudo apt install pavucontrol
  Run pavucontrol (via command or menu) :
  in output device tab, test manual change port to "headphone" or "speaker" (also in configuration tab, check "profile" is set analog)
• next control is alsamixer (with headphones connected):
  • Run alsamixer (or alsamixer -c1 if hdmi audio is first) in a terminal (maximize window)
  • using left/right arrow keys to scroll thru faders, raise volumes master/speaker/headphones (up/down arrow key) , unmute muted faders with m key (muted fader have a MM label) .
  • desactivate and activate "automute" control which could be screwed . Check also switching on/off "independant HP" and "loopback" . Normally this 2 last parameters are disabled. On some pc, i have seen one of these 3 functions create problem .
• if no success, it may be a driver problem , whats the result of
  cat /proc/asound/card0/codec#* |grep Cod
• Just saw a similar recent bug reported here , low headphone volume on Lenovo ThinkPad X1 Carbon 7th g