I've got kernel panic in radeon module (not present otherwise):
drm/radeon module: 8b8803695b24d4cb4d041437a4709be06e59471b
What did I do: I exited X.
Card: ATI Radeon 200M
8b8803695b24d4cb4d041437a4709be06e59471b seems to be a commit of drm.git, which is deprecated for the kernel modules in favour of those included with the kernel itself. If the problem also happens with those, please report to the kernel bugzilla, preferably with more information about the kernel panic.