This problem seems to be the same as in the following two Ubuntu stackexchange posts:
https://askubuntu.com/questions/768463/laptop-headphone-jack-produces-no-sound https://askubuntu.com/questions/219342/no-sound-output-from-headphone-jack-ubuntu12-04/859931 A temporary solution mentioned in those threads is: alsactl restore which fixes the problem for me. Might be a problem with Dell hardware specifically - a few comments mention Dell models. In any case it doesn't seem like a new problem since the two stackexchange posts are from 2016 and 2012. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1721537 Title: No sound from headphone jack on xps13 9350 after ubuntu 17.10 dist- upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1721537/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs