Re: missing sysrq

[Mike A. Harris]

On Fri, 1 Jun 2001, Dieter Nützel wrote:

>> > In article <[e-mail]> 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, [e-mail]
>
>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
following:

Run:

showkey -s

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

0x38
0x54

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.
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