Could you attach your dmesg output from a clean boot. Specifically we are interested in the e820 section of that output which shows how the hardware/BIOS has layed out the memory in your systems.
Here is an example from a 4GB machine which is showing 4GB of ram within the OS too: $ head -1 /proc/meminfo MemTotal: 4013952 kB [...] ] BIOS-e820: 0000000000000000 - 000000000009c400 (usable) ] BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved) ] BIOS-e820: 00000000000d2000 - 00000000000d4000 (reserved) ] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) ] BIOS-e820: 0000000000100000 - 00000000bd4a1000 (usable) ] BIOS-e820: 00000000bd4a1000 - 00000000bd4a7000 (reserved) ] BIOS-e820: 00000000bd4a7000 - 00000000bd5ba000 (usable) ] BIOS-e820: 00000000bd5ba000 - 00000000bd60f000 (reserved) ] BIOS-e820: 00000000bd60f000 - 00000000bd708000 (usable) ] BIOS-e820: 00000000bd708000 - 00000000bd90f000 (reserved) ] BIOS-e820: 00000000bd90f000 - 00000000bd918000 (usable) ] BIOS-e820: 00000000bd918000 - 00000000bd91f000 (reserved) ] BIOS-e820: 00000000bd91f000 - 00000000bd963000 (usable) ] BIOS-e820: 00000000bd963000 - 00000000bd99f000 (ACPI NVS) ] BIOS-e820: 00000000bd99f000 - 00000000bd9e4000 (usable) ] BIOS-e820: 00000000bd9e4000 - 00000000bd9ff000 (ACPI data) ] BIOS-e820: 00000000bd9ff000 - 00000000bda00000 (usable) ] BIOS-e820: 0000000100000000 - 0000000140000000 (usable) Note that although I have 4GB of ram, the last GB is actually mapped at 4-5GB physical. -- Trouble viewing beyond 3GB of available 4GB memory using 64bit kernel https://bugs.launchpad.net/bugs/114258 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