Gfilui

Recently upgraded laptop to 18.04 64 bit having previously used 32 bit version.

When I plug in a VGA monitor the laptop screen goes black and nothing appears on the external monitor. It worked fine previously on the 32 bit set-up.

Typing xrandr in a terminal with the monitor plugged in yields the following:

Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 8192 x 8192
LVDS-1 connected primary 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
 1280x800 59.98*+ 59.97 59.81 59.91
 1280x720 60.00 59.99 59.86 59.74
 1024x768 60.04 60.00
 960x720 60.00
 928x696 60.05
 896x672 60.01
 1024x576 59.95 59.96 59.90 59.82
 960x600 59.93 60.00
 960x540 59.96 59.99 59.63 59.82
 800x600 60.00 60.32 56.25
 840x525 60.01 59.88
 864x486 59.92 59.57
 800x512 60.17
 700x525 59.98
 800x450 59.95 59.82
 640x512 60.02
 720x450 59.89
 700x450 59.96 59.88
 640x480 60.00 59.94
 720x405 59.51 58.99
 684x384 59.88 59.85
 680x384 59.80 59.96
 640x400 59.88 59.98
 576x432 60.06
 640x360 59.86 59.83 59.84 59.32
 512x384 60.00
 512x288 60.00 59.92
 480x270 59.63 59.82
 400x300 60.32 56.34
 432x243 59.92 59.57
 320x240 60.05
 360x202 59.51 59.13
 320x180 59.84 59.32

VGA-1 connected (normal left inverted right x axis y axis)
 1920x1080 59.93 +
 1600x1200 60.00
 1680x1050 59.95
 1280x1024 60.02
 1440x900 59.89
 1280x960 60.00
 1280x800 59.81
 1024x768 60.00
 800x600 60.32 56.25
 640x480 59.94
DP-1 disconnected (normal left inverted right x axis y axis)

Any pointers appreciated.

Cormac