I confirm the bug on Asus Sonicmaster. Maybe adding this line to grub will allow to manage it via brightness control panel
GRUB_CMDLINE_LINUX_DEFAULT="..... acpi_backlight=vendor" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1327774 Title: asus x200la brightness hotkeys not working (rest of them do) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1327774/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
