Thank you for your comments.

Then the current state  I see in intrepid is this:

- You still need to "ENABLE_LAPTOP_MODE=1" in /etc/default/acpi-support
(Bug 244838)

- The /etc/laptop-mode/laptop-mode.conf default hdparm -B value has been
changed from 254 to 255.

This may be OK for consistency of the current state, but 254 is actually needed 
for many laptop harddisks to stop load cycling. (hdparm -B255 turns off the 
disk's apm feature, but this only turns off the spin down timer in many disks 
and doesn't increase the head parking timer at all, which is the issue here.)
(Added that info to https://wiki.ubuntu.com/PowerManagement)

Laptop-mode has always shipped with the sane defaults like 254. I see no
real reason to keep suboptimal defaults from the ubuntu hack. The
defaults can just be merged from the debian package I guess.

-- 
[intrepid] laptop-mode-tools needs to change its default settings to match 
acpi-support and add hooks for pm-utils
https://bugs.launchpad.net/bugs/250935
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