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Date: Wed, 13 Dec 2017 19:22:15 +0100 (CET)
From: BALATON Zoltan <balaton@eik.bme.hu>
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Subject: Re: [Qemu-devel] Adding more function keys support
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To: Programmingkid <programmingkidx@gmail.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>

On Wed, 13 Dec 2017, Programmingkid wrote:
>> On Dec 13, 2017, at 4:14 AM, Daniel P. Berrange <berrange@redhat.com> wrote:
>>
>> On Tue, Dec 12, 2017 at 12:49:34PM -0500, Programmingkid wrote:
>>>
>>>> On Dec 12, 2017, at 9:34 AM, Daniel P. Berrange <berrange@redhat.com> wrote:
>>>>
>>>> On Sun, Dec 10, 2017 at 02:10:41AM -0500, Programmingkid wrote:
>>>>> On Macintosh keyboards there is a key called fn that is used to give the
>>>>> function keys more functionality. Does this key exist in the keyboard keys
>>>>> database?
>>>>
>>>> When you say "Macintosh keyboards" are you talking about the old style
>>>> keyboards with Apple's custom ADB connector, or simply Apple branded
>>>> USB keyboards ?
>>>
>>> USB keyboards.
>>>
>>>>
>>>> If its the latter (USB), then please plug it into a Linux machine, and
>>>> in a text console (ie not X11) run 'showkey' and press this 'fn' key on
>>>> its own and tell me what (if any) hex code gets printed.
>>>
>>> There was no response to the fn key.
>>
>> Doh, I made a mistake - you need to run   'showkey -s'  to get raw scancodes.
>> Can you try this again, pressing 'fn' on its own, and also press 'fn' in
>> combination with some function keys.
>
> Sorry but showkey still did not register the fn key being pushed.

I don't know how the fn key is handled but the Linux driver knows about it 
so maybe it could help to understand:

https://github.com/torvalds/linux/blob/master/drivers/hid/hid-apple.c

Regards,
BALATON Zoltan