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 think that 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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laptop-mode-tools uses hparm -B 255 instead of 254
https://bugs.launchpad.net/bugs/172282
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