Are you positive that the ThinkPad actually suspends-to-RAM completely?
These symptoms read eerily similar to bug 50031 ...
** Changed in: linux-source-2.6.15 (Ubuntu)
Importance: Untriaged => High
Status: Unconfirmed => Needs Info
** Summary changed:
- Critical: XFS corruption during suspend-to-RAM
+ XFS corruption post-suspend-to-RAM in 2.6.15-25
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XFS corruption post-suspend-to-RAM in 2.6.15-25
https://launchpad.net/bugs/50275
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