Juan of post #21: many thanks!  Same problem on Toshiba Portege R600.  Setting 
"nomodeset"
as kernel parameter did the trick and made my second-monitor script combining 
xrandr and toshset, posted at 
http://www.astro.uu.nl/~rutten/Recipes_Ubuntu.html,
work again.  I had no idea how to set a kernel parameter but found clear 
instructions at 
http://grumpymole.blogspot.com/2007/05/ubuntu-how-to-edit-grub-boot-parameters.html

This fix saved my big lecture tomorrow just in time!  (this projection
business is one thing the MacBook Pro  I discarded in favor of Ubuntu
did better...)

Rob Rutten

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intel graphics laptop crashes with external monitor
https://bugs.launchpad.net/bugs/465318
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