HP pavilion dv7 f keys

I bought this laptop about 2 months ago. and I directly installed xubuntu. I was not aware but F keys stop working. one day I was looking a site and wanted to see the html dom details and hit the F12. and my wireless stop working. then I realized my function key is like pressed and my F keys was not working.

I research a lot but could not find anyway to fix this until roday :) you just need to disable it like this link says