#!/bin/sh

# discover video card's ID
ID=`lspci | sed -e '/VGA/!d' -e 's/ .*//' -e 's@0000:@@' -e 's@:@/@' -eq`

# 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

# synchronize system clock with hardware
hwclock --directisa --localtime --systohc

# 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 or hibernate
case "$1" in
  suspend)   echo -n mem > /sys/power/state ;;
  hibernate) s2disk  ;;
esac

# restore video card data from the temporary file
# on resume
cat $TMP_FILE > /proc/bus/pci/$ID

# synchronize hardware clock with system
hwclock --directisa --localtime --hctosys

# switch back to virtual terminal 7 (running X)
chvt 7

# remove temporary file
rm -f $TMP_FILE