Please try reading and writing new values to: /sys/class/backlight/intel_backlight/brightness
instead of 'actual_brightness'. The to find out the value corresponding to 100% brightness for your LCD panel look in the file 'max_brightness'. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1862835 Title: [Dell XPS 15 9570] Unable to change laptop screen brightness or keyboard backlighting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1862835/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
