Here is some more information that I collected.

I tried toggling fn-lock while at different stages of booting.

* In the grub menu, the light does not toggle.
* If I choose to boot windows, then while windows is booting, the light does 
not toggle. (ie, during the "swirling dots" screen.)
* Once windows gets to the login screen, the light does toggle.  This implies 
the light only works once windows has loaded a driver or similar.
* If I instead choose to boot Ubuntu, then the light does not toggle.  Not 
during boot, at the login screen, or after logged in.
* If I enter the BIOS setup, then the light does toggle there.  If I exit and 
boot into Ubuntu then the light no longer toggles.

I strongly suspect there is at least some OS involvement with the fn-
lock LED working.

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https://bugs.launchpad.net/bugs/1881015

Title:
  Fn Lock light does not come on to indicate when Fn Lock is enabled

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