I did recognize the same behaviour. After some research it seems that this is 
not a bug but a feature. There is an option in BIOS to change the behaviour of 
the fn-keys. Go to BIOS > System Configuration > Action Keys Mode:
- If the option is enabled, you can change brightness, loudness etc. without 
pressing the fn-key but only pressing F2, F3... I suppose, that you need to 
press Fn-Key + F1... in order to get the F1-key.
- If the option is disabled, the behaviour is vice versa.

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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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