Suspend

#!/bin/sh
 
# ensure that we are root
if [ `whoami` != "root" ]; then
  sudo $0
  exit 0
fi
 
# discover video card's ID
ID=`lspci | grep VGA | awk '{ print $1 }' | sed -e 's@0000:@@' -e 's@:@/@'`
 
# securely create a temporary file
TMP_FILE=`mktemp /var/tmp/video_state.XXXXXX`
trap 'rm -f $TMP_FILE' 0 1 15
 
# switch to virtual terminal 1 to avoid graphics
# corruption in X
chvt 1
 
# write all unwritten data (just in case)
sync
 
# dump current data from the video card to the
# temporary file
cat /proc/bus/pci/$ID > $TMP_FILE
 
# suspend
echo -n mem > /sys/power/state
 
# restore video card data from the temporary file
# on resume
cat $TMP_FILE > /proc/bus/pci/$ID
 
# switch back to virtual terminal 7 (running X)
chvt 7
 
# remove temporary file
rm -f $TMP_FILE