It definitely appears as though the "Spin down hard disks when possible"
on the "On Battery Power" tab of the power management applet is not
being respected. I have the option unchecked, and can observe the
following:

dan...@thinkpad:~$ sudo hdparm -B /dev/sda

/dev/sda:
 APM_level      = 254

(remove AC)

dan...@thinkpad:~$ sudo hdparm -B /dev/sda

/dev/sda:
 APM_level      = 1

If I manually "sudo hdparm -B 254 /dev/sda" after going to battery mode,
then the hard disk obviously stops the incessant and overly ambitious
spinning down.

I'm all for spinning down disks when on battery power, but if I
specifically uncheck that option in the power management applet, it
should be honoured. Also, when spinning down disks, something a bit more
sensible like a 2 or 5 minute idle period would be better (can we have
this adjustable maybe?)

-- 
[maverick] HD spins down all the time on AC
https://bugs.launchpad.net/bugs/606706
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