Solved this (and some other issues) for me by installing the mainline kernel
Used the "mainline" script for that
e.g. with instructions from
https://www.linuxuprising.com/2018/10/2-utilities-to-install-latest-kernel-in.html
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1881462
Title:
Brightness settings don't work on Lenovo Ideapad 5 15ARE05
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