Causing the problem on Ubuntu 12.04.1 when installing the 3.5 kernel is not too 
surprising as that kernel contains some, but not all, of the updates needed to 
support your hybrid graphics.  All of the pieces are supposedly present in 
Ubuntu 12.10, as per bug 1053250 (it doesn't mention the nouveau driver but I 
recall reading that it was upated to support hybrid graphics too), however 
hybrid graphics is only working for a select few people (such as the reporter 
of bug 1053250, who has different hardware to you) and remains problematic - 
see http://www.phoronix.com/scan.php?page=news_item&px=MTIxOTM
This article also summarizes some of the hybrid graphics improvements planned 
for Ubuntu 13.04.  See 
https://blueprints.launchpad.net/ubuntu/+spec/desktop-r-gaming-platform-graphics-support
 and especially 
https://blueprints.launchpad.net/ubuntu/+spec/desktop-r-hybrid-graphics-user-experience
 to monitor progress in this area.

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https://bugs.launchpad.net/bugs/1074779

Title:
  llvmpipe used after clean install instead of intel

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