Re: [Qemu-devel] Adding more function keys support

[BALATON Zoltan]

On Wed, 13 Dec 2017, Programmingkid wrote:
> > On Dec 13, 2017, at 4:14 AM, Daniel P. Berrange <address@hidden> wrote:
> >
> > On Tue, Dec 12, 2017 at 12:49:34PM -0500, Programmingkid wrote:
> > > > On Dec 12, 2017, at 9:34 AM, Daniel P. Berrange <address@hidden> 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