Comment 0 for bug 1530695

Since I connected external VGA (D-sub) monitor laptop's main display allways blank and black, whatever screen combinations and options I've tried with xrandr or LXrandr GUI.

xrandr output below

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 4096 x 4096
VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
   1920x1080 60.0*+
   1680x1050 60.0
   1600x900 60.0
   1280x1024 75.0 60.0
   1280x800 59.8
   1152x864 75.0
   1280x720 60.0
   1024x768 75.1 60.0
   832x624 74.6
   800x600 75.0 60.3
   640x480 75.0 60.0
   720x400 70.1
LVDS-0 connected (normal left inverted right x axis y axis)
   1024x600 60.0 +
   960x600 60.0
   960x540 60.0
   800x600 60.0 60.3 56.2
   840x525 60.0 59.9
   800x512 60.2
   700x525 60.0
   640x512 60.0
   720x450 59.9
   640x480 60.0 59.9
   680x384 59.8 60.0
   576x432 60.1
   512x384 60.0
   400x300 60.3 56.3
   320x240 60.1
DVI-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)

But I recall with HDMI external monitor everything was OK