#! /bin/sh

# Suspend-to-RAM (ACPI S3 state)
# see /usr/src/linux/Documentation/power/video.txt and
# http://www.linux.com/article.pl?sid=06/05/24/1716222
# http://www.linux.com/article.pl?sid=07/02/02/2117209

su - phd -c "xscreensaver-command -exit"

# discover video card's ID
ID=`lspci | grep VGA | awk '{ print $1 }' | sed -e 's@0000:@@' -e 's@:@/@'`

# securely create a temporary file
STATE_DIR=`mktemp -d /var/tmp/acpi_state.XXXXXX`
trap 'rm -rf $STATE_DIR' 0 1 15

# switch to virtual terminal 1 to avoid graphics corruption in X
curcons=`fgconsole`
chvt 2
clear

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

# dump current data from the video card to the
# temporary file
cat /dev/vcsa > $STATE_DIR/vcsa
cat /proc/bus/pci/$ID > $STATE_DIR/video_state

# write all unwritten data (just in case)
sync

# suspend
/etc/init.d/laptop-mode stop
echo -n mem > /sys/power/state

statedir=/root/s3
vbetool post
vbetool vbestate restore <$statedir/vbe

# restore video card data from the temporary file
# on resume
cat $STATE_DIR/video_state > /proc/bus/pci/$ID
cat $STATE_DIR/vcsa >/dev/vcsa

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

# restore states of the other subsystems
/etc/init.d/laptop-mode start
cyr # cyryllic fonts on the console

# switch back to the original virtual terminal
chvt $[curcons%6+1]
chvt $curcons

cd "$HOME"
su - phd -c "xscreensaver &"
clear

# remove temporary file
exec rm -rf $STATE_DIR