Pi 400 and HDMI audio

I tried installing on a RP 400 using HDMI audio.

For jack to work with HDMI I need to use HDMI with fkms, otherwise jack will not run.
I assume this is a general issue and missing from the documentation.

So I changed the config from kms to fkms, and jack runs.

However with this change Patchbox shows a secondary desktop on the display instead of the primary desktop.

My question is, why, and how can I fix it.

I couldnt find a way to display the primary desktop.
And fkms should not have any influence on the desktop setup.

Hey, I don’t know how to solve this, but you may try searching for information on it for Raspberry Pi OS - all the info you find will be relevant to Patchbox OS.