If you purge package laptop-mode-tools and then edit /etc/hdparm.conf to
add:
apm = 254
apm_battery = 254
after this line (line 41):
#apm = 255
Then all is well. It doesn't like laptop-mode-tools at all, though.
** Changed in: hdparm (Ubuntu)
Status: Confirmed => Incomplete
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hdparm sets power management value to 128 in AC mode
https://bugs.launchpad.net/bugs/513706
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