Hi, from this link http://www.pbehnke.com/main/node/11, I have managed
to make a shutdown anyway --

For some reason, if the usb controls are set to 'auto', the shutdown-
reboot loop starts. The solution was to make them forcefully turn 'on'.
I have added a function in the /etc/init.d/halt script --

set_usbs_on () {
    usbcontrolpath="/sys/bus/usb/devices/*/power/control"
    for dev in $usbcontrolpath;
    do
        echo "Setting $dev: " `cat $dev` "to on"
        echo on > $dev
        echo ""
    done
}

and call it before the do_stop function in the 'stop' switch in "case
$1". Now the machine shuts down.

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https://bugs.launchpad.net/bugs/1261886

Title:
  [Lenovo ThinkPad S431] Boots up after shutdown

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