Possible Duplicate:
Why does Ubuntu only show 3GB of RAM?
I changed my laptop RAM and went from 3GB to 4GB. Ubuntu still sees only 3GB, but the BIOS confirms 4096 MB installed. How do I get Ubuntu to recognize the added 1GB?
Possible Duplicate:
Why does Ubuntu only show 3GB of RAM?
I changed my laptop RAM and went from 3GB to 4GB. Ubuntu still sees only 3GB, but the BIOS confirms 4096 MB installed. How do I get Ubuntu to recognize the added 1GB?
sudo dmidecode -t memory
.