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SysRQ in Linux and Ubuntu

Feb 11, 2011, 17:34 (0 Talkback[s])

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[ Thanks to linuxaria for this link. ]

"Sometimes happen that your desktop freeze and you cannot do anything, so the only choice is to unplug the power cord ? No, Linux has the magic SysRq key that can sync your disk and issue a reboot of your system…and many more things.

"What is the magic SysRq key?

"It is a 'magical' key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely locked up.

"How to enable the magic SysRq key

"If you use a custom kernel you need to say "yes" to 'Magic SysRq key (CONFIG_MAGIC_SYSRQ)' when configuring the kernel. When running a kernel with SysRq compiled in, /proc/sys/kernel/sysrq controls the functions allowed to be invoked via the SysRq key."

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