@Fuseteam tested on my FP4.

The switch beetween headphones and speaker is automatic, music playing works well but when I have a call it switches back to phone speaker. I have to re-enter this commandline after reboot : pacmd load-module module-udev-detect

What happens to the device screen? It should display a virtual touchpad. If it does that and your external display at least detects it then that should mean it is compatible. There's a bug right now that wired external display only works once. After the initial connection, it'll just display black. You'll need to reboot to make it work again.