hdparm is contradicting itself in /usr/lib/pm-utils/power.d/95hdparm-apm
(Using LMDE+UP5, kernel 3.2+45, hdparm 9.39-1+b1)
$ head /usr/lib/pm-utils/power.d/95hdparm-apm
#! /bin/sh
#
# This script adjusts hard drive APM settings using hdparm. The hardware
# defaults (usually hdparm -B 127) cause excessive head load/unload cycles
# on many modern hard drives. We therefore set hdparm -B 254 while on AC
# power. On battery we set hdparm -B 127, because the head parking is
# very useful for shock protection.
#
# Refactored from acpi-support's 90-hdparm.sh for pm-utils
It is obviously confusing -B 127 (which permits spin-down) with APM (-B
128) permitting PM (including head-parking) but not spin-down.
For instance, on my WD Scorpio Blue WD10JPVT, which had idle3 in its
firmware modified from default 8sec to 180sec (3min) using `idle3ctl`
(or wdidle3 in DOS!), I'm parking at an acceptable rate with the default
PM level of 128, when on battery, without spin-downs, just as I wanted.
# hdparm -I /dev/sda | grep Advanced
Advanced power management level: 128
* Advanced Power Management feature set
# hdparm -I /dev/sda | grep -i standby
Standby timer values: spec'd by Standard, with device specific minimum
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https://bugs.launchpad.net/bugs/952556
Title:
[Precise] [Hardware-killer] HD restarts every few seconds
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