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