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f33e652
(Get the code!)
I can confirm that this bug affects me too, but unfortunately the workaround suggested by @sureshot16 that worked for some users here did not work for me, so I think it wouldn't for some makes and models.
For reference, I'm on a laptop with the following specifications:
Lenovo Legion Y540
NVIDIA GTX 1650 Mobile/Max-Q
Ubuntu 20.04
kernel 5.8.0-38 generic
I've had brightness issues on previous versions of the NVIDIA drivers as well, somewhat constantly, but they'd stop once I suspended the laptop and opened it up again once. This is not the case for the 460 driver.