I am now also reminded of this "feature", which was a patch in 16.04 and seems to be an upstreamed feature in 17.10:
https://git.launchpad.net/~ubuntu-audio- dev/pulseaudio/tree/debian/patches/0100-switch-on-port-available-Switch- from-HDMI-to-analog-.patch?h=ubuntu-xenial Not sure if it's related. That module "switch-on-port-available" is definitely one that Ubuntu uses but is not mentioned in the documentation: https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/ So I'm not yet sure what it's meant to do. ** This bug is no longer a duplicate of bug 1702794 Automatically switch audio devices on connection -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1707611 Title: Sound does not automatically play on new audio device Status in pulseaudio package in Ubuntu: Incomplete Bug description: When connecting a HDMI cable or other audio device, the user must manually click on the "sound volume" in the top-right and switch to the newly connected device. Example: you connect a HDMI cable to the television, but then you must manually choose the HDMI sound option; it does not get selected automatically. Often times e.g. when the HDMI cable is disconnected, the user must then manually click on the "speakers" or "line out" setting - EVEN IF IT'S ALREADY SELECTED, it must be clicked on again for the sound to work through the computer's speakers. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1707611/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
