Could you try updating your firmware and see if this problem still persist. 
Latest firmware can be found here:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-67989

As for the dmesg  message you see  is unrelated. This just an event that
the version of thinkpad-acpi in hardy does not know about. Newer
versions of thinkpad-acpi kernel module handle this event.

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Impossible to change LCD brightness on Thinkpad R61i
https://bugs.launchpad.net/bugs/198476
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