Kevin, I can't reproduce this issue on an older dell latitude laptop.
When pressing the brightness hardware keys (actually Fn + up/down arrow)
the brightness slider moves accordingly, and then moving the slider
correctly changes the brightness.

Note that I am running zesty with a locally fixed systemd package (see
bug 1661568). I wonder if what you are seeing is a side-effect of the
aforementioned systemd issue.

My proposal is to try again in a few days, when the fixed systemd
package will have landed to zesty (hopefully). If the problem persists
we can investigate further.

** Changed in: repowerd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1660438

Title:
  display brightness & slider follows hw keys, but brightness does not
  follow slider unity8 zesty

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