[PATCH 4/10] Documentation/sysrq.txt: update KEY_SYSRQ info

From: Randy Dunlap
Date: Mon May 17 2010 - 19:30:54 EST

From: Paul Fox <pgf@xxxxxxxxxx>

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key), i realized that the documentation was quite out of date.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: Paul Fox <pgf@xxxxxxxxxx>
Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Documentation/sysrq.txt | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

--- lnx-2634-docs.orig/Documentation/sysrq.txt
+++ lnx-2634-docs/Documentation/sysrq.txt
@@ -177,13 +177,13 @@ virtual console (ALT+Fn) and then back a

* 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?


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