Magic Sysreg key problems.

[Heinz Diehl]

On 21.08.2012, Aaron Konstam wrote: 

> > 	/usr/share/doc/kernel-doc-(version)/Documentation/sysrq.txt
> I appreciate all these tips but none make the sysrq suctions work. I'll
> just give up.

1. Look into your kernel .config if m-sysrq is in your kernel:
CONFIG_MAGIC_SYSRQ=y

Standard Fedora kernels have it compiled in, but it is disabled by default.

2. Set "kernel.sysrq = 1" in /etc/sysctl.conf and do a "sysctl -p".

3. Now press the right ALT key together with PrtScrn, keep
holding this combination and press e.g. "s". Now you should see this
in /var/log/messages:

Aug 21 07:53:07 wildsau kernel: [ 1541.017462] SysRq : Emergency Sync
Aug 21 07:53:07 wildsau kernel: [ 1541.017702] Emergency Sync complete