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Why is more than 3GB of RAM not recognised when using amd64?

I have installed ubuntu 10.04 lts (64bit) on my lenovo thinkpad X60 (Core 2 Duo T5600). I installed 4gb of ram before installing ubuntu, but when I check the available memory in Ubuntu it says that only 2.9gb is installed. I have checked the bios and it shows the full 4gb of ram. Any help with this would be appreciated.

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marked as duplicate by Bruno Pereira, James, fossfreedom, Jorge Castro, htorque Jan 23 '12 at 20:49

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

The problem is due to the Mobile Intel 945GM Express chipset in your laptop.

This site, suggests your computer uses the 945GM Express,and the top answer on Why is more than 3GB of RAM not recognised when using amd64? gives a more complete explanation.

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