[lkml]   [2001]   [Jun]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: missing sysrq
On Fri, 1 Jun 2001, Dieter Nützel wrote:

>> > In article <> you wrote:
>> > > However, if I go to /proc/sys/kernel/sysrq does not exist.
>> >
>> > It is a compile time option, so the person who compiled your kernel
>> > left it out.
>> I compiled it, and the sysrq is definitely in the config. No doubt at
>> all. I also use make mrproper and config again before dep and actual
>> compile. Maybe it is just a quirk/oddball.
>> D. Stimits,
>Have you tried "echo 1 > /proc/sys/kernel/sysrq"?
>You need both, compiled in and activation.

If you *know* it is compiled into your kernel, and you *know* it
is enabled via the above, and it still does not work, do the


showkey -s

Then press LALT quickly followed by SYSRQ, and keep holding both
down, and you should see:


You might see a bunch of extra 0x38's which is ok.

If however when you press ALT-SYSRQ you see:

0x38 0x54 0xd4

and are still holding both keys down, then your keyboard is
broken and incompatible with the kernel SYSRQ feature.

A proper keyboard will only show "0x38 0x54". I have written a
patch for SYSRQ to allow it to be used with broken keyboards that
send the make+break code for the SYSRQ sequence simultaneously.

If you need it, let me know and I'll send it to you.

Mike A. Harris - Linux advocate - Open Source advocate
Opinions and viewpoints expressed are solely my own.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:55    [W:0.090 / U:1.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site