This morning I started the netbook with the TV plugged in. Netbook
screen was dead and TV good. (slightly different behaviour from last
night) Output of xrandr -q was:

Screen 0: minimum 320 x 200, current 1360 x 768, maximum 4096 x 4096
VGA1 connected 1360x768+0+0 (normal left inverted right x axis y axis) 1102mm x 
620mm
   1360x768       60.0*+
   1024x768       75.1     70.1     60.0  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     60.0  
   720x400        70.1  
LVDS1 connected (normal left inverted right x axis y axis)
   1024x600       60.0 +
   800x600        60.3     56.2  
   640x480        59.9 

I then restarted with the TV unplugged. Netbook screen was good again. I
plugged in the TV and it came alive with the strange black screen and
limited mouse pointer described above. Output of xrandr -q was:

Screen 0: minimum 320 x 200, current 1024 x 600, maximum 4096 x 4096
VGA1 connected (normal left inverted right x axis y axis)
   1360x768       60.0 +
   1024x768       75.1     70.1     60.0  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     60.0  
   720x400        70.1  
LVDS1 connected 1024x600+0+0 (normal left inverted right x axis y axis) 223mm x 
125mm
   1024x600       60.0*+
   800x600        60.3     56.2  
   640x480        59.9

-- 
External display won't display
https://bugs.launchpad.net/bugs/634068
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