Standby problem with ubuntu 10.10 64bit

hi,

i own a laptop Lenovo 3000 N500 with nvidia graphic card 4 gig of memory and 320gig hard disc.

i had ubuntu 32 bit on my laptop from version 9.4 until now and had no problem with standby and hybernate.

since i installed the ubuntu 10.10 64 bit version on this laptop following problem occoured.

1. standby
 the system will go to standby but the resume cause the system to reboot.

2. hybernate
  the system reboots directly.

i have found this solution on internet and putt it in the file "/etc/pm/sleep.d/20_custom-ehci_hcd" but it didn't work on my laptop.

#!/bin/sh

TMPLIST_E=/tmp/ehci-dev-list
TMPLIST_X=/tmp/xhci-dev-list
E_DIR=/sys/bus/pci/drivers/ehci_hcd
X_DIR=/sys/bus/pci/drivers/xhci_hcd
E_BIND=$E_DIR""/bind
E_UNBIND=$E_DIR""/unbind
X_BIND=$X_DIR""/bind
X_UNBIND=$X_DIR""/unbind

#param1 = temp file, param2 = device dir, param3 = unbind
unbindDev (){
#inspired by http://art.ubuntuforums.org/showpost.php?p=9744970&postcount=19
  echo -n '' > $1
    for i in `ls $2 | egrep '[0-9a-z]+\:[0-9a-z]+\:.*$'`; do
      echo -n "$i" | tee $3
      echo "$i" >> $1
  done
}

#param1 = tem file, param2 = bind
bindDev(){
  [ -f $1 ] || return

  for i in `cat $1`; do
    echo -n "$i" | tee $2

  done
  rm $1
}

case "${1}" in
  hibernate|suspend)
    unbindDev $TMPLIST_E $E_DIR $E_UNBIND
    unbindDev $TMPLIST_X $X_DIR $X_UNBIND
        ;;
  resume|thaw)
    bindDev $TMPLIST_E $E_BIND
    bindDev $TMPLIST_X $X_BIND
        ;;
esac

can any one help me plz??