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    Check your BIOS for a setting to toggle the Fn key behavior. Commented Jun 26, 2012 at 11:05
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    Unfortunately, most BIOSes don't allow Fn behavior to be changed in any way. Your symptoms don't look like a problem with the BIOS though: the BIOS wouldn't know how to minimize a window. It looks like Fluxbox has mapped F4 to minimizing a window. Please post your Fluxbox configuration, and also tell us what Ubuntu release you're using. Do you see the same symptoms on a new account with no Fluxbox configuration? What about with other window managers? Commented Jun 26, 2012 at 21:55
  • I know it is not BIOS issue, I just mentioned it, because BIOSes on Lenovo notebooks allow to switch the function on Fn key. -> I'll edit original post and add what u asked for. Commented Jun 27, 2012 at 8:40
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    @Gilles Most laptops come with extra functions on the F1-F12 keys for actions like suspend, toggle wireless/touchpad, multimedia/volume control keys, that are accessed by holding down Fn. I've seen many laptops that have a BIOS option to choose whether the physical key registers as F1-F12 or the extra function, since a lot of end users don't use the F1-F12 keys. Thinkpad Edge's even do this by default (you need Fn-F1 to get F1). What I meant was if this is the case, finding the BIOS option would be much easier than trying to remap each F1-F12 key individually. Commented Jun 27, 2012 at 13:18
  • @mat - I'm a relative newcomer here. I see that you made an edit but left in the phrase "You see, I'm a programmer ..." which had me LOL-ing. Is there guidance on this kind of humor? Maybe it's a question for meta ... Commented Feb 9, 2018 at 12:30