Ok, if 2.6.32-14 is the last working kernel version, I tried to find out
the changes to -15. One line related to Ironlake (the GPU integrated in
the Core i5) is this in upstream kernel changes:

* drm/i915: disable hotplug detect before Ironlake CRT detect

Corresponding patch is available at http://lwn.net/Articles/375436/.
IANAKernelHacker, but my guess is its got something to do with this.

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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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