Disable autosuspend for bluetooth device 8087:07dc

rc.local.sh

# ==> see http://ubuntuforums.org/showthread.php?t=2159645&page=6&p=12926730#post12926730
# ==> this is almost a direct copy of the solution presented there.  Thanks, obadz! :)
#     (aka http://ubuntuforums.org/member.php?u=923361)
#
# Include this somewhere it gets called at boot, for optimal effect; e.g. /etc/rc.local
 
# Prevents the Bluetooth USB card from autosuspending, which (as of this edit) borks it
BTUSB_DEV="8087:07dc"
BTUSB_BINDING="$(lsusb -d "$BTUSB_DEV" |
  cut -f 1 -d : |
  sed -e 's,Bus ,,' -e 's, Device ,/,' |
  xargs -I {} udevadm info -q path -n /dev/bus/usb/{} |
  xargs basename)"
 
 
echo "Disabling autosuspend for Bluetooth USB device: $BTUSB_BINDING..."
echo -1 > "/sys/bus/usb/devices/$BTUSB_BINDING/power/autosuspend_delay_ms"

unkill_bluetooth_on_suspend.sh

#! /bin/sh

# unblock our bluetooth on resume.  This appears to be necessary for certain
# Intel bluetooth interfaces.

case $1 in
     suspend|suspend_hybrid|hibernate)
        # No need to do anything here, AFAICT
        :
        ;;
     resume|thaw)
        rfkill unblock bluetooth
        ;;
esac