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Re: kern/37683 (ukbd: new useful mappings from usb to at keycodes) writes:
| Synopsis: ukbd: new useful mappings from usb to at keycodes
| State-Changed-From-To: open->feedback
| State-Changed-By:
| State-Changed-When: Sat, 02 Feb 2008 15:10:09 +0000
| State-Changed-Why:
| The extra keys are neither mentioned in the USB-HID spec nor in Microsoft's
| specification. Do you know of any technical document which lists the codes?


Yes, that's a kind of hack from Xorg (and XFree). Those "extended keys"
are defined in atKeynames.h (e.g. /usr/pkg/include/xorg/atKeynames.h)
because PS/2 keyboards cannot generate such events.

Xorg says:
 * Fake 'scancodes' in the following ranges are generated for 2-byte
 * codes not handled elsewhere.  These correspond to most extended keys
 * on so-called "Internet" keyboards:
 *      0x79-0x93

This file is not used when using the 'standard' xorg keyboard protocol
and the translation is done by ukbd (hence this PR). OpenBSD has a
similar patch for their driver (their cvsweb seem to be down right now, I
cannot find the rev number but it's in ukbd.c too, from
M. Herrb). FreeBSD did also something similar in rev. 1.46 of ukbd.c,
although I don't know where their mappings come from.

Note that the atKeyname file is used inside the bsd kbd driver module
(see PR/37674).

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