Audio output device changes upon unlock/login

[Karl Marks]

I have a ThinkPad X250 and updated To Ubuntu 19.10 today from 19.04.

Locking/Suspending and logging in changes my audio output device.
This did not happen in 19.04.

==== How to reproduce ====

When I lock my session with key combination "Win+L" and then unlock it again, the sound that's been playing through my headphones/speakers stops playing. When I check the audio settings, "HDMI/DisplayPort 2 - Built-in audio" is selected.
When I select "Headphones - Built-in audio", sound continues playing.

There is no related log output in dmesg.

[Karl Marks (biosin)]

Forgot to mention: my home folder is encrypted.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1848731

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1847570, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Karl Marks (biosin)]

Thanks for responding. Yes, the workaround works to comment out load-module module-switch-on-connect.

Sorry, I thought I looked at all the bugs tagged with eoan, must have overlooked it.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Vincent Tschanz (fogia)]

Ubuntu needs a lock feature in the gnome sound settings, because each time a device is detected the output/input will change automatically. Sometimes this feature is wanted (I plug-in a headphone) sometimes it's not (I don't want the sound output to switch to my monitor when I power it since no speakers are plugged to it)