Seems like this issue caused by HP's fn key driver for windows
I own 440 G6 and had this issue for a long time
but mystically it dissapeared once after my laptop was discharged for a long 
time
but after win10 installation (2nd ssd with it died, so i installed new one and 
reinstalled w10) it stopped work again

ive tried to update bios, but reverted it back as newer bioses locks
possibility of enabling intel speedstep

and only power reset solves issue until you will boot windows again

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https://bugs.launchpad.net/bugs/1841039

Title:
  Multiple keys have same keycode on HP ProBook 450 G6

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