It can be helpful to separate your issues into individual threads. This way, any solution for that issue can be marked and be helpful to other members searching the forum.
Can you please make a new thread for the Sound Issue and for the Fingerprint reader?
I am not sure what you mean by the "Special touchpad" - this may also be a separate issue.
This first thread can focus on the FN keys.
Commonly this can be resolved by adding the grub parameter acpi_osi=Linux.
Please be sure to run sudo update-grub after making changes to the grub file.