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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