Are you on the standard issued Zorin kernel -- 5.15.0-88-generic? I've been reluctant to try updating to a 6.x.x kernel myself, having a 'newer' setup - when was your machine manufactured? I think my ZenBook was a '21 production - another laptop I picked up in 2022 likes only 6.2.x and above, nothing from 5.15, or 5.19 though, no keyboard backlight at that.
There is a guide in the forums on updating the kernel, safely - here - might just be kernel support missing; that's usually my case with missing usability...
I'm going to do a little more research on this - there has to be an actual answer somewhere out there 
-- apart from kernel and extra setup stuff manually installed. .