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syncand/or hit Alt-SysRq-s before power-off via alt-sysrq-o, if you had any filesystems mounted read-write. See en.wikipedia.org/wiki/Magic_SysRq_key / docs.kernel.org/admin-guide/sysrq.html for Alt-SysrQ. The only documentation I've ever printed, from the days when I only had one computer. Alt-Sysrq-U unmounts (or actually remounts read-only), so on wedged systems it's A-S-U, A-S-S, wait for disk activity to stop, A-S-B (reBoot). Apparentlypoweroffby default makes asyncsystem call, unless you use--no-sync. Magic-Sysrq doesn't.