Charles,
Can you please try adding the following entry to /etc/modprobe.d/options 
(without quotes):
   "options thinkpad_acpi backlight=1"
Then reboot into the latest kernel and see if the problem persists.  Also 
please post your kern.log after doing that, and let us know the outcome.
Thanks.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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[Regression] Screen brightness not 100% at boot or resume from monitor sleep
https://bugs.launchpad.net/bugs/322610
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