This bug was fixed in the package nvidia-graphics-drivers-455 -
455.45.01-0ubuntu1

---------------
nvidia-graphics-drivers-455 (455.45.01-0ubuntu1) hirsute; urgency=medium

  * New upstream release (LP: #1904863):
    - Fixed a bug in a Vulkan blending optimization that could
      produce incorrect results. Some of the Vulkan titles affected
      by this bug were:
        Life is Strange 2
        Shadow of the Tomb Raider
    - Fixed an issue that caused Vulkan swapchain creation to fail
      for full-screen windows when a G-SYNC monitor is connected.

  [ Kai-Heng Feng ]
  * debian/71-nvidia.rules:
    - Add rules to enable runtimepm by default.

  [ Alberto Milone ]
  * debian/add-ids-to-json-db,
    debian/additional_runtimepm_ids,
    debian/rules:
    - Make it possible to add new IDs to mark support
      for runtimepm.
  * 
debian/templates/nvidia-compute-utils-flavour.nvidia-persistenced.service.in:
    - Run persistenced.service before systemd-backlight@backlight:nvidia_0
      (LP: #1885087)

 -- Alberto Milone <alberto.mil...@canonical.com>  Thu, 19 Nov 2020
14:23:18 +0100

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https://bugs.launchpad.net/bugs/1885087

Title:
  Can't keep brightness value after reboot/poweroff in some nvidia gfx

Status in OEM Priority Project:
  Fix Committed
Status in OEM Priority Project bionic series:
  Fix Committed
Status in OEM Priority Project focal series:
  Fix Committed
Status in nvidia-graphics-drivers-450 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-455 package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-450 source package in Bionic:
  Fix Released
Status in nvidia-graphics-drivers-455 source package in Bionic:
  Fix Released
Status in nvidia-graphics-drivers-450 source package in Focal:
  Fix Released
Status in nvidia-graphics-drivers-455 source package in Focal:
  Fix Released
Status in nvidia-graphics-drivers-450 source package in Groovy:
  Fix Released
Status in nvidia-graphics-drivers-455 source package in Groovy:
  Fix Released

Bug description:
  systemd-backlight saves the brightness value right before
  shutdown.target, however it doesn't work because the nvidia_0
  backlight sysfs disappears after GFX device is closed by Xorg, long
  before shutdown.target.

  [Impact]
  System can not keep the brightness value, after reboot/poweroff the 
brightness will still be highest.

  [Fix]
  Suggested by Nvidia, we need to run nvidia-persistenced.service before 
systemd-backlight@backlight:nvidia_0.service

  [Test Case]
  Adjust the brightness value, reboot, the value must keep persistence during 
boots.

  [Regression Risk]
  Low, this fix is just adjust the systemd order more earier.

  
  https://github.com/hugh712/nvidia-graphics-drivers

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