On linux 6.6.0 the new GNOME backlight control of my Laptop (Lenovo IdeaPad 5 Pro 14ARH7) does not work. The issue is not present on linux 6.5.x. Not a big deal though, as it wasn’t a feature in GNOME before.
Might then be a linux mainstream issue…
I just switched from stable to testing - in case this is relevant.