no SysRq key

[Jorge Almeida]

I've been trying to enable the use of the SysRq key. My keyboard is
Logitech Access. It has a key labeled PrtScr/SysRq right next F12. 
I recompiled the kernel with support for SysRq. The file
/proc/sys/kernel/sysrq exists and contains "1". Still it doesn't work. 
It seems that the key is not recognized. The output of showkey -s, when
pressing SysRq, is
0xe0 0x2a 0xe0 0x37 0xe0 0xaa 0xe0 0xb7
I read sysrq.txt in the kernel source Doc directory:
         There are some keyboards that send different scancodes for SysRq than the
         pre-defined 0x54. So if SysRq doesn't work out of the box for a certain
         keyboard, run 'showkey -s' to find out the proper scancode sequence. Then
         use 'setkeycodes <sequence> 84' to define this sequence to the usual SysRq
         code (84 is decimal for 0x54). It's probably best to put this command in a
         boot script. Oh, and by the way, you exit 'showkey' by not typing anything
         for ten seconds.
It's not clear (to me) what to do. Does <sequence> equal "0xe0 0x2a 0xe0 0x37 0xe0 0xaa 0xe0 0xb7"?
And if so, is this a stable thing, i.e. a keyboard characteristic, not
bound to change unless the keyboard is replaced?


-- 
Jorge Almeida