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.

NOTE!

This Script has some limitations:

• It is not totally reliable, e.g. on some (all?) R32 the values ACPI reports for the battery are wrong by factor 10. They are actually reported in cWh instead of mWh. The script assumes they are reported in mWh as on most ThinkPads - hence the power consumption appearce to be only a tenth of its actual value.
• The script assumes you have only one battery. If you have a second battery (for example, an UltraBay Slim battery), take it out for this test or change occurrances of "BAT0" in the script to "BAT1". If you do the latter, you will get bogus results if the second battery is run down while sleeping.
• The usage threshold of 1000 mWh might be a bit a bit too tolerant. You can try lowering it to 500 (if [ $USAGE -gt -500 ]) to be sure.

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.