new beta driver does not fix this issue,
brightness fn-keys still do not work with nvidia driver...
(on samsung R70 aura T7500 Denet)
my first post and email were ignored...
brightness fn-keys do work nice with nv, vesa, mesa driver's OR in tty1 console and so on.
the possible way to change the backlight brightness if nvidia driver is used(loaded):
ctrl+alt+f1 --> changing brightness with fn keys --> alt+f7 back to X with nvidia driver.