The backlight device only gets registered after it's opened by graphical session.
And the backlight gets unregistered when graphical session stops, hence when systemd-backight@.service's "Conflicts=shutdown.target" triggers, the backlight is already gone so the brightness wasn't saved. Since it's not saved, the backlight won't be restored for next boot. The easiest approach is to let nvidia driver always registers the backlight device. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. 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: New Status in nvidia-graphics-drivers-418 package in Ubuntu: New Status in nvidia-settings package in Ubuntu: New Status in systemd package in Ubuntu: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/1840592/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
