I recently tested dapper final release on a t22 and had not problems there (with or without dock). So is this still a issue for you in dapper/final?
** Changed in: Ubuntu
Status: Unconfirmed => Needs Info
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Thinkpad T22 - X.org/GDM freeze GPU when docked (Flight 6 +)
https://launchpad.net/bugs/39333
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