Windows 10: What are these mysterious Fn+[key] functions?

While trying to solve another issue I found these weird key combinations with uncertain functions. BTW, my PC is DELL XPS 13 9310, Windows 10 Pro Build 19044.What are these keys? And is it documented somewhere? Are there more such functions?Key combinationScan codeTested Functionubuntu manpagesvirtual key visual cueFn+R57399PrintScreen- missing --Fn+AltGr+R84?KEY_SYSRQ 0x54Fn+S70?KEY_SCROLLLOCK 0x46ScrLkFn+Ctrl+S70Does `^C` in cmd.exe basically same as Ctrl+CKEY_SCROLLLOCK 0x46ScrLkFn+AltGr+S70?KEY_SCROLLLOCK 0x46ScrLkFn+B69NumLockKEY_NUMLOCK 0x45Num LockFn+Ctrl+B57414?KEY_PAUSE

:)

 

No effect upon pressing <fn> and a function key

I have an ASUS laptop, K52JC, it used to perform certain function when combination of <fn> key and a function key are pressed simultaneously. For example -

• Pressing <fn> and <F10> simultaneously will mute the sound
  
• Pressing <fn> and <F11> simultaneously will decrease the volume
  
• Pressing <fn> and <F12> simultaneously will increase the volume, and so forth
  

I have its Windows 10 re-installed recently. Everything works fine after the installation, except when combination of <fn> key and a function key are pressed simultaneously, no effect seems to be generated, as the computer does not respond accordingly.

Please advise how to resolve the above problem.

 

FN key always on

If you press “Num Lock" (might also be labeled "Num Lk”) (I’ve also seen it labeled “Pad Lock” for numeric Pad) it turns on the blue keys, and inverts the meaning of the “Fn” key – it’s a way to use that embedded numeric keypad without having to hold down the “Fn” key the entire time. To fix it, just find and press the “Num Lock” or “Pad Lock” key again. (Note, sometimes these keys are themselves “Fn” keys, so you may, or may not, need to also hold down the “Fn” key to get the right function.) Often there is an indicator light associated with the setting.

 

Use function keys without fn

I have a problem. I am having trouble enabling function keys without holding the FN. It previously worked since I bought it. But this year I had to reinstall the operating system due to an infection I couldn't remove. After the reinstall, I realized that
I can't use the volume keys and the brightness keys without using FN. FN is enabled. First I looked up the problem on my laptop's brand website, and they suggested me to download the appropriate application to enable this function. After I installed it, I
couldn't locate it. It didn't even show up on Start menu, neither it showed on the search companions. Next I called the brand company's technical support. I asked the person to give me the path where the application's path, but he told me it was corrupted,
which it's not because it shows that it's installed on the Programs and Features list. The support group offered me support with over $60, which I can't afford. He just asked me to looked up the problem myself online, but one of the solutions gave me alternate
software to install, but it didn't work. Next I went to the Settings and I tried to find "Function Keys" but no result. I own Windows 10 on a Toshiba Satellite C55.

Anyone who does know how to enable function keys WITHOUT using FN keys? I am really frustrated.

Thanks.