I posted a comment related to this issue : 
https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/74394/comments/5

I'm not an expert but I thing the problem is in power.sh : it doesn't
make the difference whether or not laptop-mode is installed (and enabled
on ac or battery) and overwrite the hdparm settings.

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power.sh must reapply laptop-mode settings after suspend
https://bugs.launchpad.net/bugs/229693
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