Hi, I also encountered this problem.
the backlight is black when boot up from CD.
After I add a "i915.modeset=0 in the kernel command line", I'm able to boot 
into desktop, and add the option to /etc/default/grub, and run "update-grub", I 
can enter to system, but no brightness control, no virtual effect.
#45 might have fixed this issue, but what about i386 package?

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[lucid] Blank screen with KMS on Thinkpad X201 with Arrandale (i915)
https://bugs.launchpad.net/bugs/554569
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