People looking for a temporary workaround can try this: Add GRUB_CMDLINE_LINUX="nomodeset acpi_backlight=vendor" in /etc/default/grub and run update-grub.
-- xrandr backlight property control missing (when using KMS?) https://bugs.launchpad.net/bugs/428054 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs