Another accidental discovery: I have started to use a USB mouse
recently, and when I leave the mouse plugged in when shutting down, the
problem reoccurs. When I click "Shutdown," then unplug the mouse, power
down completes successfully. (Always assuming that I run only Debian
between power on and power down.)
Another observation: With the USB mouse plugged in, Ubuntu 14.04 runs
into the same issue. So, Ubuntu will power down OK, whether or not I ran
a mix of Debian and Ubuntu since last power on. It will, however, fail
to power down when I leave the USB mouse plugged in.
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