The problem is actually kernel modesetting (KMS). With KMS, the kernel
takes over control of the screen brightness completely, and ACPI no
longer gets to control things. The correct thing to do is to some how
hook up the ACPI keys (Fn+{up,down}) to the setpci commands. However, it
is unclear at what level all this should happen... Can we use/abuse
things like upower? Or is the acpid script the cleanest way to proceed?

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https://bugs.launchpad.net/bugs/538256

Title:
  Screen brightness not controllable on Lenovo Ideapad S10-3, U350, and Z360

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