setkeycodes, sysrq, and USB keyboard

[federico <xaero@inwind.it>]

hi all,

i have a problem: i got a white Apple usb keyboard, but this keyboard
doesn't have PrintScr nor SysRq.
i read in Documentation/sysrq.txt how to change the SYSRQ scancode.
i launched showkey and acknowledged that R_Alt+F13 is 100,183 => 64b7.
i ran

 # setkeycodes 64b7 84
KDSETKEYCODE: No such device
failed to set scancode b7 to keycode 84

i'm on a gentoo-vanilla 2.6.13_rc1 with kbd-1.12-r5. (or on
2.6.11-gentoo-r9 which produces the same result)

here's some relevant output from strace:

open("/dev/tty", O_RDWR) = 3
ioctl(3, KDGKBTYPE, 0xbffdfcb7) = 0
ioctl(3, KDSETKEYCODE, 0xbffdfd20) = -1 ENODEV (No such device)
dup(2) = 4
fcntl64(4, F_GETFL) = 0x8001 (flags O_WRONLY|O_LARGEFILE)
close(4) = 0
...
write(2, "KDSETKEYCODE: No such device\n", 29KDSETKEYCODE: No such device
) = 29
...
write(2, "failed to set scancode 64b7 to k"..., 42failed to set scancode
64b7 to
keycode 84
) = 42

if anyone has a possible solution i really appreciate.
ciao!

-- 
Federico