Public bug reported:

I believe this to be a relatively serious bug. In maverick, if I press
the printscreen key, the keyboard will stop working until I restart the
computer. After I hit printscreen, any other keys I press will add this
to /var/log/messages:

[  152.650996] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-
tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J)
saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-
tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-
task-states(T) Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)

** Affects: ubuntu
     Importance: Undecided
         Status: New

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[Maverick only] Pressing printscreen hangs keyboard
https://bugs.launchpad.net/bugs/592042
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