This looks like one keypress would cause a massive spew of uevents
and/or evdev events. Can you please run  "sudo evtest" and "udevadm
monitor -e", then press a brightness key once, then ^C both and
copy&paste the output?

I don't get this on my ThinkPad X230, I have the opposite problem
(brightness keys not working at all any more with 4.8 due to acpi_video0
disappearing, bug 1626429).

** Changed in: ubuntu
       Status: New => Incomplete

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  brightness keys are handled slower in Yakkety than Xenial

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