You need to update your BIOS and EC to the latest versions. BIOS 3.05a
is very old (Can't see your EC version, but I expect it to be similarly
old).
I had the same problem with a T41. For details on how to upgrade, see
the www.thinkwiki.org site. I updated using the floppy image on a boot
CD (All explained at the above web site).
** Changed in: linux (Ubuntu)
Status: New => Invalid
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.294408] thinkpad_acpi: WARNING: Outdated ThinkPad BIOS/EC firmware
https://bugs.launchpad.net/bugs/617949
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