[Bug 1681493] Re: Ubuntu Zesty: Problem With Screen Brightness Settings

[aljosa]

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-375 (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  Ubuntu Zesty: Problem With Screen Brightness Settings

Status in NVIDIA Drivers Ubuntu:
  New
Status in nvidia-graphics-drivers-375 package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Non-Optimus laptop ASUS G752VS (Nvidia GTX1070)
  Ubuntu 17.04
  Xorg-Server-1.19.3
  Nvidia driver 375.39

  Situation on 2017-04-05:
  Ubuntu 17.04 doesn't save my brightness settings. I can adjust the screen brightness, but after restarting the screen brightness of my laptop resets to maximum.

  Situation on 2017-04-08:
  Today I received many Ubuntu updates (kernel included), and I also installed freshly released Nvidia 381.09 driver (via “Graphics Drivers” team - Proprietary GPU Drivers PPA).
  Now brightness settings are correctly saved, but I have a new problem: changing brightness level doesn't produce any effect (both with or without Nvidia driver installed)

  Inside "/sys/class/backlight/" I have two folders: "acpi_video0" and
  "acpi_video1"

  ~$ systemctl status systemd-backlight at backlight:acpi_video0.service
  ● systemd-backlight at backlight:acpi_video0.service - Load/Save Screen Backlight B
     Loaded: loaded (/lib/systemd/system/systemd-backlight at .service; static; vendo
     Active: active (exited) since Sat 2017-04-08 13:37:31 CEST; 16min ago
       Docs: man:systemd-backlight at .service(8)
   Main PID: 683 (code=exited, status=0/SUCCESS)

  ~$ systemctl status systemd-backlight at backlight:acpi_video1.service
  ● systemd-backlight at backlight:acpi_video1.service - Load/Save Screen Backlight B
     Loaded: loaded (/lib/systemd/system/systemd-backlight at .service; static; vendo
     Active: active (exited) since Sat 2017-04-08 13:37:31 CEST; 22min ago
       Docs: man:systemd-backlight at .service(8)
   Main PID: 684 (code=exited, status=0/SUCCESS)

  Situation on 2017-04-10:
  I purged Nvidia 381.09 driver and reinstalled default Nvidia 375.39 via additional drivers.
  Now the situation has returned to initial problem: I can again adjust the screen brightness, but after restarting the screen brightness of my laptop again resets to maximum.

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