Ubuntu: No sound from speakers, headphones jack detected even when no headphones are connected

Question

I have a problem with the audio in Ubuntu 17.10. No sound from speakers unless auto-mute from alsamixer is disabled. In that case sound goes to both speakers and headphones.

All sound cards are installed, however, even when headphones are not connected the only available output remains headphones-internal audio.

So far I did a fresh install of Ubuntu 17.10, run a live version of Ubuntu 16.04, 17.10, and Fedora, but no luck.

All this makes me think of a harware failure, in particular that the switch of headphones output jack socket is not working as it should. I tried to gently clean it, but nothing. However, audio hardware failure is quite unlikely to happen (I hope at least).

After each boot speakers are muted in alsamixer, unmuting them and increasing the volume produce sound from speakers, but of course the speakers are not automatically disabled when headphones are connected.

Note that the audio worked properly with Ubuntu 17.04, and also with 17.10 (at least for a week), then suddenly stopped without updating anything.

Machine: Lenovo Yoga 2 Pro.

arecord -l
**** Lista di CAPTURE dispositivi hardware ****
scheda 1: PCH [HDA Intel PCH], dispositivo 0: ALC3239 Analog [ALC3239 Analog]
  Sottoperiferiche: 1/1
  Sottoperiferica #0: subdevice #0

EDIT: Here the output for cat /proc/asound/card*/codec#*

Moreover:

• I just tried to run a live usb with Windows and the problem is still there;

• evtest for mic and heaphones reports them always connected (even if not).

• I conclude that actually this is a hardware problem. I am going to replace the entire sound card, and I will update this post as soon as I have a final response.

SOLUTION (hardware problem): Replacing the sound board fixed the problem (40 Euros for a new one from eBay).

Answer 1

Guess: The laptop BIOS is lying to ALSA, and giving it a wrong headphone jack codec node which always detects "connected".

Look at your analog codec with

cat /proc/asound/card*/codec\#*

and use hdajackretask from package alsa-tools-gui to correct this if it is true.

Also see here for background information.

I don't know why it happened "suddenly", and can't explain the "sudden" change, but that's the first place I'd look. It's probably unrelated to the distro you are using, and it might have been always broken, and your hardware "suddenly" decided to switch from "undetected" to "detected" for the unused node with open pins. Or something complete different.

Edit

The Pin Complex info provided by the BIOS looks ok (or at least not as jumbled as the "lying" ones I've seen), so maybe it's something else. Try the following: Run evtest as root, select (in turn) each device that corresponds to soundcard plug events (usually they have HDA Intel or something similar in the name), and plug in/out your headphone and see if you actually receive events. According to the codec, you should have at least two of those, one for the headphone (Node 0x21) and one for the mic (Node 0x19).

Possibly the headphone/mic jack detection hardware is just broken. Or maybe something completely different.

Answer 2

1. Check terminal.
2. Run alsamixer.
3. Make sure nothing is muted.
4. And ALSO check that AUTOMUTE IS DISABLED.