Public bug reported:

The keys marked for brightness control on the keyboard are supposed to be Fn+F5 
(down) and Fn+F6 (up).
But pressing them does not have any effects.
Volume control keys Fn+F1 (off), Fn+F2 (down), Fn+F3 (up) all do work, and KDE 
shows appropriate indicators when they are pressed.
I know this is a popular problem with Lenovo laptops.
I use Ubuntu 21.04 Hirsute on built-in NVMe, but Ubuntu 20.04 booted from USB 
flash drive also does not allow me to control screen brightness.
Hardware and OS information will be collected on Apport request and attached 
here.
** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1907308

Title:
  screen brightness up/down keys not working in LENOVO IdeaPad 5 15IIL05

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