How to enable SysRq key?

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I want my SysRq key to be fully functional.

When I look in sudo sysctl -a I see kernel.sysrq = 1 in the output. This tells me it should be working.

To test, I run echo h > /proc/sysrq-trigger but nothing happens. I've tried this in a terminal emulator as well as a TTY. I was expecting to see some help text.

Pressing Alt+PrintScreen+h or PrintScreen+h also does not work.

What am I missing? How can I make the SysRq key work?

arch-linux sysrq

posted almost 2 years ago

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2y ago

matthewsnyder‭

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Outputs to kernel log (2 comments)

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Thanks to the comments, I was able to determine that it is in fact working, I just wasn't looking in the right place for output.

For anyone else with the same/similar issue, start watching the correct log with: sudo dmesg -w

After that, Alt+PrintScreen+h will print a brief help message.

Of course, you could always use b which should produce a reboot as the "output", but that is a bit destructive for a test.