I have this issue as well on elementaryOS based on Ubuntu 18.04:
Linux Celer 5.4.0-52-generic #57~18.04.1-Ubuntu SMP Thu Oct 15 14:04:49
UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Tried booting with
thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor
But no luck either. There is something in
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1895782
Title:
Screen
