I here confirm that changing the option in BIOS solve the issue.
I have solved the brightness issue reinstalling bash:
oject.org/wiki/Common_F16_bugs#Bash_entry_in_.2Fetc.2Fshells_disappears_after_update

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https://bugs.launchpad.net/bugs/910082

Title:
  Fn-keys not functional on HP 635 laptop (volume, brightness, wifi
  switch...)

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