[Bug 1833532] [NEW] systemd-backlight does not restore screen brightness after reboot

[Luca Mastromatteo]

Public bug reported:

As the title says, on this laptop the brightness controls are NOT saved
after reboot.

What is saved instead, is only the keyboard brightness.

I have tested two distros, Ubuntu 18.04.2 LTS and 19.04, happens on both
systems. But there is a difference

On 19.04, "systemctl status systemd-backlight@:*intel_screen_backlight_*" shows:
"Saved brightness 20 too low, increasing to 75"

On 18.04.2 does not show anything rather than the service starting
normally

The laptop is a Dell XPS 15 9550, the screen backlight driver is the
intel one.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1833532

Title:
  systemd-backlight does not restore screen brightness after reboot

Status in systemd package in Ubuntu:
  New

Bug description:
  As the title says, on this laptop the brightness controls are NOT
  saved after reboot.

  What is saved instead, is only the keyboard brightness.

  I have tested two distros, Ubuntu 18.04.2 LTS and 19.04, happens on
  both systems. But there is a difference

  On 19.04, "systemctl status systemd-backlight@:*intel_screen_backlight_*" shows:
  "Saved brightness 20 too low, increasing to 75"

  On 18.04.2 does not show anything rather than the service starting
  normally

  The laptop is a Dell XPS 15 9550, the screen backlight driver is the
  intel one.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1833532/+subscriptions