Dvalemodus var slått av med hensikt i Ubuntu 12.04. Men for at dvalemodus skal virke skikkeleg, må du først få kvilemodus til å virke. Som oftast kan ein finne ei løysing på det meste:

http://ubuntuforums.org/showthread.php?t=1978290

• Opne ein terminal
• Skriv sudo gedit /etc/pm/sleep.d/20_custom-ehci_hcd
• Trykk Enter/Linjeskift
• Kopier og lim inn dette:

#!/bin/sh
#inspired by http://art.ubuntuforums.org/showpost...0&postcount=19
#...and http://thecodecentral.com/2011/01/18...ot-working-bug
# tidied by tqzzaa :)
VERSION=1.1
DEV_LIST=/tmp/usb-dev-list
DRIVERS_DIR=/sys/bus/pci/drivers
DRIVERS="ehci xhci" # ehci_hcd, xhci_hcd
HEX="[[:xdigit:]]"
MAX_BIND_ATTEMPTS=2
BIND_WAIT=0.1

unbindDev() {
 echo -n > $DEV_LIST 2>/dev/null
 for driver in $DRIVERS; do
 DDIR=$DRIVERS_DIR/${driver}_hcd
 for dev in `ls $DDIR 2>/dev/null | egrep "^$HEX+:$HEX+:$HEX"`; do
 echo -n "$dev" > $DDIR/unbind
 echo "$driver $dev" >> $DEV_LIST
 done
 #for bus in $EHCI_BUSES; do
 echo -n $bus > /sys/bus/pci/drivers/ehci_hcd/unbind
 # done
 done
}
bindDev() {
 if [ -s $DEV_LIST ]; then
 while read driver dev; do
 DDIR=$DRIVERS_DIR/${driver}_hcd
 #for bus in $EHCI_BUSES; do
 echo -n $bus > /sys/bus/pci/drivers/ehci_hcd/bind
 #done
 while [ $((MAX_BIND_ATTEMPTS)) -gt 0 ]; do
 echo -n "$dev" > $DDIR/bind
 if [ ! -L "$DDIR/$dev" ]; then
 sleep $BIND_WAIT
 else
 break
 fi
 MAX_BIND_ATTEMPTS=$((MAX_BIND_ATTEMPTS-1))
 done
 done < $DEV_LIST
 fi
 rm $DEV_LIST 2>/dev/null
 chvt 1
 chvt 7
}
EHCI_BUSES="0000:00:1a.0 0000:00:1d.0"
case "$1" in
 hibernate|suspend)
 unbindDev;;
 resume|thaw)
 bindDev;;
esac

• Lagre fila
• Lukk gedit
• Skriv sudo chmod 755 /etc/pm/sleep.d/20_custom-ehci_hcd

Etter ein restart skal kvilemodus virke.