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Commit a2056ffd authored by Paul Fox's avatar Paul Fox Committed by Dmitry Torokhov
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Input: Documentation/sysrq.txt - update KEY_SYSRQ info 



While setting up sysrq operation on the XO laptop (which lacks a SysRq
key), i realized that the documentation was quite out of date.

Change documentation of SysRq to reflect current KEY_SYSRQ value.

Signed-off-by: default avatarPaul Fox <pgf@laptop.org>
Signed-off-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent ee6e54e2

Documentation/sysrq.txt

+7 −7
Original line number Diff line number Diff line
@@ -177,13 +177,13 @@ virtual console (ALT+Fn) and then back again should also help. 


*  I hit SysRq, but nothing seems to happen, what's wrong?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.

There are some keyboards that produce a different keycode for SysRq than the

pre-defined value of 99 (see KEY_SYSRQ in include/linux/input.h), or which

don't have a SysRq key at all. In these cases, run 'showkey -s' to find an

appropriate scancode sequence, and use 'setkeycodes <sequence> 99' to map

this sequence to the usual SysRq code (e.g., 'setkeycodes e05b 99'). 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.



*  I want to add SysRQ key events to a module, how does it work?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~