Comment 0 for bug 1907308

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.