I had already tried the "EnableBrightnessControl=1" kernel parameter a
year ago but I tried it anyway, no effect. However, trying the
suggestion of @paulplusx I can happily report that brightness works
flawlessly after using
"nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1" with the latest
49
Just to add to the report by @manzood, this bug affects my variant of y540 as
well.
My complete laptop spec is as follows:
Lenovo Legion Y540
NVIDIA GTX 2060 Mobile
Ubuntu 18.04
kernel 5.4.0-72-generic
and again, the workaround suggested by @sureshot16 does not work, editing
/sys/class/backligh
