If I plug in an external monitor to my laptop and run `xrandr`, it is auto-configured by g-s-d.  If I then unplug it and run `xrandr` again, the external display recognized as off by g-s-d, *but* it also turns off my laptop's screen.

This seems to happen because the laptop's "output" isn't set as "primary" in g-s-d.  If I set it as such in the auto_configure_outputs method (just setting all the "remained on" ones to primary, for now) it solves this issue.

Do you think that's the right approach?  Or should we get the laptop output in g-s-d's auto-configure with get_laptop_output_info and set primary = TRUE just for that?

One thing to note is when I call `xrandr`, the output name for the internal monitor is "PANEL" not LCD or LVDS; eg

    PANEL connected 1920x1200+0+0 (normal left inverted right x axis y axis)
287mm x 215mm
       1920x1200Scaled   60.4* 

But just changing g-s-d (in 2.28.2)'s is_laptop method to include PANEL in its string checks doesn't fix the problem.  I doubt fixing it in 2.30's gnome_rr_output_is_laptop would help either, based on examining from where that method is called.