Public bug reported:

I am not sure if this is the right place to report this, so feel free to
move it elsewhere.

It looks like the systemd-backlight service (/lib/systemd/system
/[email protected]) does not restore the brightness level
(although it saves it before shut-down).

However the following command does restore the saved brightness:

sudo /lib/systemd/systemd-backlight load backlight:intel_backlight

As a temporary solution to automate it at boot I am using the following
line added to the root cron:

@reboot /lib/systemd/systemd-backlight load backlight:intel_backlight

- Ubuntu 4.10.0-20.22-generic 4.10.8
- Gnome 3.24

Please, let me know if you need more info. Thanks.

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

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https://bugs.launchpad.net/bugs/1686268

Title:
  Backlight brightness level not restored after reboot

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