OK, a bit more data:
Xenial with 4.4 and 4.8 kernels - works fine (so not a 4.8 kernel regression)
Yakkety with 4.4 and 4.8 kernels - shows the slow behavior (so not a kernel
issue)
So I think this is a problem in the plumbing layer.
** Changed in: systemd (Ubuntu)
Assignee: (unassigned) => Martin Pitt (pitti)
** Tags removed: kernel-4.8
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https://bugs.launchpad.net/bugs/1626651
Title:
brightness keys are handled slower in Yakkety than Xenial
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