I have a multi-monitor setup where I want to use *either* my laptop screen
*or* my external monitor. I've set up an "autoxrandr" script like this, to
enable an external monitor if it's connected, and to enable the laptop
panel otherwise:

for output in $(xrandr | grep '\Wconnected' | awk '{ print $1 }'); do
    if [[ ! $output =~ ^LVDS.*$ ]]; then

if [ "$other" != "" ] ; then
  xrandr --output $other --auto --primary --output LVDS1 --off
  xrandr --output LVDS1 --auto --primary

The trouble is that when the laptop is connected to an external screen, and
when I turn the monitor off, it seems that i3 exits. What I want instead is
that it either keeps running so that I can switch the laptop screen on, or
that I can configure it to automatically turn the laptop screen on.

I have no clue where to debug this. This is on Ubuntu 14.04 and using
lightdm. The lightdm logs say that the session (i3) exits and that's why
its stopping the session. I don't think I can get i3 logs using the
instructions at http://i3wm.org/docs/debugging.html because both i3 and the
X session are dead after this happens.

Any idea what I could try here?

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