This bug has reappeared, when GNOME Sensors Applet (sensors-applet) is
monitoring hddtemp, which I think is the default when sensors-applet is
added to a GNOME panel.  This is on a laptop with laptop-mode enabled,
and occurs when on battery.  It prevents the disk from spinning down, or
causes it to spin back up immediately afterward.

To reproduce, in Intrepid:

-Add GNOME Sensors Applet to the gnome panel.
-While on battery power, run blktrace and see hddtemp causing disk activity 
several times per minute.

To fix:
-Under "Sensors Applet Preferences", disable hddtemp monitoring.

-- 
running hddtemp causes unnecessary disk activity
https://bugs.launchpad.net/bugs/160621
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