I have done a fresh install of Fedora 34 with Gnome 40 on my Asus Zenbook 3 (UX390) and everything works nice and smoothly except for the audio volume control. The audio is either maxed (no matter the position of the slider) or muted (slider all to the left).
I’ve updated the OS to the latest, even performed a fresh installation (of F34) but it didn’t help … Had to re-install F33 eventually.
I beleive it’s a global concern, hopefully to be solved soon to re-upgrade.
Note: I’m using HP ProBook 450 G5
Note 2: The sound (along with the volume controllers) worked fine only after the fresh installation for a while before I update the OS (using dnf update I mean) … Then the sound output device disappeared again.