ACPI sleep power drain test script

The following script will suspend your notebook to ram and output some statistics about the power drain during suspend to /var/log/battery.log. The output will look something like this:

Di Jan 11 14:01:15 CET 2005
before: 41170 mWh
after: 41000 mWh
diff: -170 mWh
seconds: 1671 sec
result: -366 mW
Congratulations, your model seems NOT to be affected.

Please save this script to a file, i.e. sleep.sh, make it executable (chmod +x sleep.sh) and execute it as root while your notebook is on battery. To get representative values you should leave the notebook suspended for at least 20 minutes.

#!/bin/sh
# sleep.sh test script for measuring power drain during suspend-to-ram with ACPI

# remove USB for external mouse before sleeping
if lsmod | grep '^usbhid' >/dev/null ; then
   /sbin/modprobe -r -s usbhid
fi
if lsmod | grep '^uhci_hcd' >/dev/null ; then
   /sbin/modprobe -r -s uhci_hcd
fi
if lsmod | grep '^ehci_hcd' >/dev/null ; then
   /sbin/modprobe -r -s ehci_hcd
fi

hwclock --systohc

LOG=/var/log/battery.log
date >> $LOG
DATE_BEFORE=`date +%s`
BAT_BEFORE=`grep 'remaining capacity' /proc/acpi/battery/BAT0/state | awk '{print $3}'`
echo "before: $BAT_BEFORE mWh" >> $LOG

echo 3 > /proc/acpi/sleep

DATE_AFTER=`date +%s`
BAT_AFTER=`grep 'remaining capacity' /proc/acpi/battery/BAT0/state | awk '{print $3}'`
echo "after: $BAT_AFTER mWh" >> $LOG

DIFF=`echo "$BAT_AFTER - $BAT_BEFORE" | bc`
SECONDS=`echo "$DATE_AFTER - $DATE_BEFORE" | bc`
echo "diff: $DIFF mWh" >> $LOG
echo "seconds: $SECONDS sec" >> $LOG
USAGE=`echo "($DIFF * 60 * 60) / ($SECONDS)" | bc`
echo "result: $USAGE mW" >> $LOG
if [ $USAGE -gt -1000 ]
then
    echo "Congratulations, your model seems NOT to be affected." >> $LOG
else
    echo "Your model seems to be affected." >> $LOG
fi
if [ $SECONDS -lt 1200 ]
then
    echo "!!! The notebook was suspended less than 20 minutes." >> $LOG
    echo "!!! To get representative values please let the notebook sleep" >> $LOG
    echo "!!! for at least 20 minutes." >> $LOG
fi
echo "" >> $LOG

if !(lsmod | grep '^ehci_hcd') >/dev/null ; then
   /sbin/modprobe -s ehci_hcd
fi
if !(lsmod | grep '^uhci_hcd') >/dev/null ; then
   /sbin/modprobe -s uhci_hcd
fi
if !(lsmod | grep '^usbhid')   >/dev/null ; then
   /sbin/modprobe -s usbhid
fi

hwclock --hctosys

The script was originally written by Jan-Hendrik Benter and was modified a little for this page.