I just booted with acpi_backlight=vendor and that solves the issue. Happy to help debug the issue to help other users of this hardware avoid the problem.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1309584 Title: Backlight does not work on intel driver after upgrade from 13.10 -> 14.04, acpi_backlight=vendor solves To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309584/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
