I've finally fixed this. It was a problem in the BIOS. I had to enable the "Memory Remap feature", and now Ubuntu can see all 4GB of RAM. Marking invalid.
** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- Only seeing 3.1GB of RAM on 64-bit machine https://bugs.launchpad.net/bugs/593422 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs