How to fully use the 4G in my Laptop under Ubuntu 9.10 - 32-bit

Posted by jfmessier on Super User See other posts from Super User or by jfmessier
Published on 2009-11-09T13:33:22Z Indexed on 2010/05/31 7:23 UTC
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I have a Toshiba A100, which I upgraded to 4G of RAM. The hardware startup indeed shows 4G of RAM, and I recently installed Windows 7, just to see how it behaves on it. So far so good, it displays 4G of RAM. Not that I tried to use it all, but it displays it. Previously under XP, I also would see 4G of RAM.

But under Ubuntu 9.10 (32 or 64 bits), it only displays 2.9 G of RAM. And my kernel is the "pae" compiled one, which is supposed to do the trick to work around the 32-bit CPU limitation.

How can I get Ubuntu to fully use my 4G of RAM ?

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