on my setup, solved by this:
https://www.sentinelstand.com/article/ubuntu-1910-on-lenovo-legion-y540
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https://bugs.launchpad.net/bugs/1881462
Title:
Brightness settings
same situation on kernel 5.4.0 on lenovo ideapad L340 with bios BGCN31WW
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https://bugs.launchpad.net/bugs/1881462
Title:
Brightness settings don't work on Lenovo Ideapad 5
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