Linux recognize only partial memory

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http://stackoverflow.com – I tried different linux distro (Ubuntu 12.10 Gnome Remix, Fedora 18, Bridge Linux) on my new laptop but all of them have a problem with memory. My laptop has 4 GB memory but Ubuntu recognize only 2,4 GB. Obviously both BIOS and Windows 8 recognize all 4GB. My laptop configuration: Lenovo B590 CPU: Intel Core i5-3210M Ram: 4 GB DDR3-SDRAM Chipset motherboard: Intel HM77 Express Integrated graphics: HD Graphics 4000. it may be possible that the lost memory is borrowed from Intel HD Graphics? if it's true, it always borrows fixed maximum memory?! Some useful command outputs: midecode --type (HowTos)