Arch Linux

Sometimes, when my laptop is resumed from sleep, I notice that the hard drive's APM level (corresponds to hdparm -B) is 128, whereas it should be either 1 or 254, as set in laptop-mode.conf:

CONTROL_HD_POWERMGMT="auto"
BATT_HD_POWERMGMT=1
LM_AC_HD_POWERMGMT=254
NOLM_AC_HD_POWERMGMT=254

Following https://bbs.archlinux.org/viewtopic.php?id=149683 , I created and made executable a file /usr/lib/systemd/system-sleep/laptop-mode.sh with the following content:

#!/bin/sh

set -e

case "$1" in
pre)
;;
post)
/usr/bin/laptop_mode auto force
;;
esac

Though the file gets executed on resume, the problem still appears. If I manually execute "laptop_mode auto force" later, the settings are restored. Since the value 128 is not one of the preconfigured, and since this seems to happen not every time, there could be a race condition between this script and something else.

Package versions:
community/laptop-mode-tools 1.63-3
core/systemd 204-3

Steps to reproduce:
* Set up laptop-mode to control HDD APM level
* Suspend and resume the PC
* Run hdparm -B on the drive to see that the level is not as configured