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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.