/etc/pm/sleep.d/20_custom-ehci_hcd for Dell XPS 13 Developer Edition

20_custom-ehci_hcd

#!/bin/bash
# inspired by http://art.ubuntuforums.org/showpost...0&postcount=19
# ...and http://thecodecentral.com/2011/01/18...ot-working-bug
# tidied by tqzzaa :)
# fixed and reformatted by Matteo Panella (@rfc1459)

VERSION=1.2
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
    echo -n > $DDIR/unbind
  done
}

bindDev() {
  if [ -s $DEV_LIST ]; then
    while read driver dev; do
      DDIR=$DRIVERS_DIR/${driver}_hcd
      echo -n > $DDIR/bind
      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
}

case "$1" in
    hibernate)
      unbindDev;;
    thaw)
      bindDev;;
esac