I also have the NP770Z5E. What helped me was to change the grub kernel boot parameter to
acpi_osi=linux acpi_backlight=video in /etc/default/grub (line GRUB_CMDLINE_LINUX_DEFAULT=) (I have Debian Linux). Hint was found at https://wiki.archlinux.org/index.php/Backlight#Kernel_command-line_options After command "update-grub" and reboot changing brightness was possible again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1485246 Title: Backlight issue - Samsung Chronos 7 (model - NP770Z5E) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
