Ok this is not the same system but a similar lenovo with lagging
brightness.  I could not get evtest to tell me about the event on any
sensible channel.  But I am attaching the udev monitor and forkstat
output.  This shows a single kernel backlight event and a single
synthetic udev event for the backlight.  From that there are 34 forks.

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  brightness keys are handled slower in Yakkety than Xenial

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