Librem5: No echo cancellation

Describe your issue

What's the expected behaviour?

During a phone call on a Librem5, the person on the other end expects to have a clear call with no echo.

What's the current behaviour?

All people on the other end of a phone call complain about hearing their own voice echo-ing back to them.

How to reproduce your issue?

Call someone on the Librem5 using Gnome calls

What device are you using?

purism-librem5

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v23.06

• v22.12 (Supported until 2023-07-06)

• I confirm that the issue still is present after running sudo apk upgrade -a

On what environment did you encounter the issue?

Environments

• GNOME Shell on Mobile
• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

Additional information

#2103 (closed) no longer seems relevent, so I expect echo cancelling to work. It seems to be supported by Purism: https://source.puri.sm/Librem5/librem5-base/-/blob/pureos/byzantium/default/audio/pulse/librem5.pa#L19