I can confirm for Lenovo Thinkpad (P15/P17/T15g/T15p/P15v Gen 1) that
backlight control is working now since the last BIOS update Version 1.28
below excerpt from the readme file:
CHANGES IN THIS RELEASE
Version 1.28
[Important updates]
Update includes a security fix.
[New functions or enhancements]
Updated the Diagnostics module to version 04.22.000.
Update Regulatory Information.
[Problem fixes]
Fixed an issue where Power-On Password is set by WMI even if Power-On
Password Control was disabled.
Fixed an issue where Linux adjust brightness fail in discrete mode.
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https://bugs.launchpad.net/bugs/1905591
Title:
no brightness control in {455,460} after update from 450
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