Only seems to occur when the PC has been connected to AC charger for a very long time. Unfortunately I cannot reproduce that situation at the moment.
** Attachment added: "acpidump.gz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1752376/+attachment/5070862/+files/acpidump.gz -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1752376 Title: Dell Vostro 5568 - Sound device disappears after connecting headphones Status in linux package in Ubuntu: Triaged Bug description: With all kernel versions so far tested including mainline v4.15.4 the audio device permanently disappears even after a cold reboot once the headphones have been plugged/unplugged. Looks to be a firmware issue; latest firmware has been installed but issue remains. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1752376/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp