T400s display flashes when the power cord disconnected - how to fix?

Just got my T400s a few days previously and very happy with it!  But one thing that bothers me is when I unplug ac power chords, screen goes white, then back on. The same thing when I plug ac power chord back in.  I posted this question in another forum (NBR) and someone replied that this problem has disappeared after a clean install of the operating system without Thinkpad utils.  So, it has something to do with one of the utils.  BUT I can't find anywhere how to disable this behavior.  Please advice!

Binaryspiral solution worked for me - thanks.

Tags: ThinkPad Notebooks

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