Just discovered that the value returned by grep . /var/lib/systemd/backlight/* is ALWAYS the value of cat /sys/class/backlight/intel_backlight/brightness BEFORE reboot.
So to summarize: 1. the grep . /var/lib/systemd/backlight/* shows the value of the brightness that was right before the last reboot. That doesn't change real-time when I change the brightness with the slider. The value appear to get stored right before the reboot. 2. the cat /sys/class/backlight/intel_backlight/brightness shows whatever is the current value of the brigtness and is stored/updated real-time, as soon as I change it with the slider or the hardware key === example === # brigtness at maxixmum level (1500) <reboot> $ cat /sys/class/backlight/intel_backlight/brightness 1500 $ grep . /var/lib/systemd/backlight/* 1500 <reducing brightness with the slider> $ cat /sys/class/backlight/intel_backlight/brightness 450 $ grep . /var/lib/systemd/backlight/* 1500 <reboot> $ cat /sys/class/backlight/intel_backlight/brightness 1500 $ grep . /var/lib/systemd/backlight/* 450 <reducing brightness with the slider> $ cat /sys/class/backlight/intel_backlight/brightness 300 $ grep . /var/lib/systemd/backlight/* 450 <reboot> $ cat /sys/class/backlight/intel_backlight/brightness 1500 $ grep . /var/lib/systemd/backlight/* 300 <reducing brightness with the slider> $ cat /sys/class/backlight/intel_backlight/brightness 600 $ grep . /var/lib/systemd/backlight/* 300 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1686268 Title: Backlight brightness level not restored after reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686268/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
