The brightness control only works with intel_backlight. Blacklist this machine for unregistering ACPI video driver and not using vendor backlight driver.
https://www.mail-archive.com/platform- driver-...@vger.kernel.org/msg05397.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1353307 Title: [Lenovo B470e] Unable to control brightness on 12.04.5 To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1353307/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
