[PATCH] change SysRq keycode for systems without SysRq key

federico ferri
2007-07-13T22:20:46Z

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this patch adds an entry in Kconfig after 'config MAGIC_SYSRQ' which
asks for a different keycode (replacing also KEY_SYSRQ with
CONFIG_MAGIC_SYSRQ_KEYCODE in char/keyboard.c)

it was tested on some USB keyboards (Microsoft and Apple USB keyboards,
and it works)

I sumbitted this patch two years ago, but it was ignored.

I think this patch is very important, even to a non-developer (SysRq-k
is very helpful when testing unstable software/drivers)

--
federico ferri

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diff -uprN linux.orig/drivers/char/keyboard.c linux/drivers/char/keyboard.c
--- linux.orig/drivers/char/keyboard.c 2005-07-09 21:47:50.000000000 +0200
+++ linux/drivers/char/keyboard.c 2005-07-10 14:42:34.000000000 +0200
@@ -1081,7 +1087,7 @@ static void kbd_keycode(unsigned int key
printk(KERN_WARNING "keyboard.c: can't emulate rawmode for keycode %d\n", keycode);

#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
- if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
+ if (keycode == CONFIG_MAGIC_SYSRQ_KEYCODE && (sysrq_down || (down == 1 && sysrq_alt))) {
sysrq_down = down;
return;
}
diff -uprN linux.orig/lib/Kconfig.debug linux/lib/Kconfig.debug
--- linux.orig/lib/Kconfig.debug 2005-07-09 21:47:22.000000000 +0200
+++ linux/lib/Kconfig.debug 2005-07-09 21:50:44.000000000 +0200
@@ -28,6 +28,16 @@ config MAGIC_SYSRQ
send a BREAK and then within 5 seconds a command keypress. The
keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
unless you really know what this hack does.
+
+config MAGIC_SYSRQ_KEYCODE
+ int
+ prompt "Change SysRq key-code" if MAGIC_SYSRQ
+ default 99
+ depends on MAGIC_SYSRQ
+ help
+ If your keyboard doesn't have a SysRq key (also labeled PrintScr),
+ you can specify another keycode which should act as SysRq.
+ Default is 99 (KEY_SYSRQ).
+ You can find this number using programs like evtest, or (maybe)
+ showkey.

config LOG_BUF_SHIFT
int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" if DEBUG_KERNEL