[Bug 1840592] Re: systemd-backlight does not save and restore brightness for nvidia display

[Ayush Akarsh]

I have a nvidia 1650 graphic card on my legion-Y540 with ubuntu 20.04
I had fixed my brightness issue(Function keys not working) by adding  Option "RegistryDwords" "EnableBrightnessControl=1" in the device section of /etc/x11/xorg.conf

It worked perfectly well until a software update, then now method
worked, and I am only able to adjust brightness with the help of
brightness controller, but in that I cannot use night mode, cause it
sets the brightness to maximum only, whenever I use that.

Please help!!

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https://bugs.launchpad.net/bugs/1840592

Title:
  systemd-backlight does not save and restore brightness for nvidia
  display

Status in nvidia-graphics-drivers package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-418 package in Ubuntu:
  Confirmed
Status in nvidia-settings package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Running nvidia gtx 1080 graphics card, with proprietary nvidia drivers
  on ubuntu 19.04. I can change screen brightness from 0% to 100% in 5%
  steps. However, after a reboot or after a shutdown, brightness level
  reverts to 100%. Please fix to is "remembers" the current brightness
  value at shutdown time, like in does Windows.

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