[Bug 1502307] [NEW] improper APM settings chosen when power status cannot be determined

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On my *desktop* machine, on_ac_power returns 255 as a status code, which
according to the man page means "Power status could not be determined".
This is reasonable, but unfortunately /etc/apm/event.d/20hdparm takes it
(*) as meaning "use the conservative setting" which sets the hard drive
to spin down after 90 seconds of inactivity. This is entirely
inappropriate for a desktop machine, as now I have to wait several
seconds each time I access my non-system hard drive.

/etc/apm/event.d/20hdparm should really take 255 to mean "this is
unlikely to be a battery-powered machine at all, don't mess with the
power management settings".

(*) relevant snippet:

choose_power ()
{
    if on_ac_power > /dev/null
    then
	power_performance
    else
	power_conserve
    fi
}

** Affects: hdparm (Ubuntu)
     Importance: Undecided
         Status: New

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improper APM settings chosen when power status cannot be determined
https://bugs.launchpad.net/bugs/1502307
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