On the u-s-d side there is some potential optimization: Ideally the
brightness would always be set through xrandr XBACKLIGHT, which works
unprivileged, and only fall back to the helper if that is not available
and the brightness needs to be set via sysfs properties. However, even
then there is no reason why --get-brightness would need particular
privileges: these sysfs attributes are world-readable, and only --set-
brightness (writing the attribute) needs root. This would already cut
away half of the overhead.

** Changed in: policykit-1 (Ubuntu)
    Milestone: None => ubuntu-16.10

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  brightness keys are handled slower in Yakkety than Xenial

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