It seems that the header only behaviour is triggered by the loglevel of
the kernel being low due to the kernel command line option 'quiet'.  You
can modify the running kernel loglevel using sysrq-8 and then later
sysrq commands should be visible. You may want to return loglevel to
normal later; sysrq-4.

** Changed in: ubuntu
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Changed in: ubuntu
       Status: Triaged => In Progress

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SysRq output not going to the console
https://bugs.launchpad.net/bugs/314681
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