path: root/Documentation/sysrq.txt
diff options
authorPaul Fox <>2010-05-19 10:11:13 -0700
committerDmitry Torokhov <>2010-05-19 10:14:15 -0700
commita2056ffd4ae9e578ff9abb5eb49137020af71fd4 (patch)
tree9994be5959824107ee3466ad58780d47a4165607 /Documentation/sysrq.txt
parentee6e54e2ae56734a96fd7b66cf46b756d0f25ca3 (diff)
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setting up sysrq operation on the XO laptop (which lacks a SysRq key), i realized that the documentation was quite out of date.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: Paul Fox <> Signed-off-by: Randy Dunlap <> Signed-off-by: Dmitry Torokhov <>
Diffstat (limited to 'Documentation/sysrq.txt')
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
index d56a01775423..5c17196c8fe9 100644
--- a/Documentation/sysrq.txt
+++ b/Documentation/sysrq.txt
@@ -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?