Thanks piwacet, this patch fixed it.
(http://lists.freedesktop.org/archives/intel-gfx/2009-June/002975.html)
I just compiled i915 with the patch, updated initramfs and rebooted.
X started and I could login with KMS enabled..
** Changed in: xorg (Ubuntu)
Status: New => Confirmed
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GDM: Can't log in with KMS enabled
https://bugs.launchpad.net/bugs/393455
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