Ubuntu 18.04 No audio from speakers. Headphones working

Question

I updated my Surface Pro 3 From Ubuntu 17.10 to Ubuntu 18.04 (did a clean install) and now I can only get audio when using the headphone jack. I have already tried all these:
troubleshooting guide
this answer
another answer

I went back and tested the live CD and even the live cd has no audio through the speakers. so this must be related to 18.04. I never had sound issues before and under windows audio still works correctly.
Does anyone have any idea how to fix this?

Update: here is my alsa iformation

Update HOLY CRAP... I removed the /etc/modprobe.d/alsa-base.conf and now sounds works ! i am going to try adding line by line to see which config entry was breaking the audio

@stumblebee nothing. I tried disabling it then reconecting headphones and switching the mute on all channels. same problem — Carlos Roque, May 09 '18 at 19:53
With my alc662 did not work at all. I am desperate. NO SOUND — n_lona, Apr 01 '19 at 21:31
I've disabled "auto-mute" in alsamixer and it worked. Thank you. — rmmariano, Sep 12 '20 at 00:02

score 2 · Accepted Answer · answered May 10 '18 at 14:35

welp.... I have no idea what just happened.... but renaming /etc/modprobe.d/alsa-base.conf to /etc/modprobe.d/alsa-base.bk , then rebooting the computer fixed the my speaker sound issue.

I then restored line by line to /etc/modprobe.d/alsa-base.conf, rebooting between restored lines, until all lines were back.... and ... it still worked! so I restored the original /etc/modprobe.d/alsa-base.conf and rebooted the computer and everything was still working.... so I am not sure what the problem was but is now fixed.

Ubuntu 18.04 No audio from speakers. Headphones working

1 Answers1