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/backlight/acpi_video0/brightness does not work(except when
prime-select is set to intel),
adding 'Option "RegistryDwords" "EnableBrightnessControl=1"' to
/usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf does not work neither does
adding kernel parameters in grub config.
This brightness issue has been a thorn in my side for the better part of
a year, the only version which works is the Nouveau display driver
installed via "Software & Updates" but has no CUDA support or Steam
integration so that's a deal breaker for me.
Unlike @manzood, suspending the laptop and resuming has never worked for
me and causes artifacts and flickering in 460 specifically. Issue
persists in 465 as well.
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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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