hello everyone!!!! i have a Hp laptop dv9000 and i installed Linux Ubuntu 8.04; with 3 gb. Ram (stock).... this afternoon i upgraded the ram memory to 4 gb.... but when i check the system monitor..instead of mark 4 gb , it still mark 3 gb... does anybody know if the Ubuntu O.S detects automatically when you upgrade the Ram memory..or i have to configure it.... i will appreciate your help!!!! thanks....

Is your bios reporting the correct amount of memory?

You might need to rebuild the kernel because the stock ubuntu one only supports 3GB. Debian has a -bigmem kernel for this very purpose but I'm not sure about ubuntu.

Really?! Ubuntu has a 3GB recognition limit? I had no idea. Can anyone confirm this? Several of my machines have 8-16 GB RAM, but those machines all run Fedora, and there are no issues with recognition of all the RAM.

All discussions I've seen on this issue point to it being a matter of 32-bit vs. 64-bit issue regardless of the OS. From what I read, 32-bit OS (whether Windows or Linux) will not show 4GB RAM. Google search will reveal all forum posts, mailing lists, etc.