Looking at your e820 information, it looks like the BIOS is telling you
that there's only approximately 3GB of RAM usable (see the one entry
marked usable below, 0000000000100000 - 00000000b7fd0000).
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[ 0.000000] BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000b7fd0000 (usable)
[ 0.000000] BIOS-e820: 00000000b7fd0000 - 00000000b7fe5600 (reserved)
[ 0.000000] BIOS-e820: 00000000b7fe5600 - 00000000b7ff8000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000b7ff8000 - 00000000c0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fec00000 - 00000000fec02000 (reserved)
[ 0.000000] BIOS-e820: 00000000ffbc0000 - 00000000ffcc0000 (reserved)
[ 0.000000] BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved)
You might check your BIOS settings to see if there's anything in there
that you can change (I don't know what to tell you to look for though,
it could be reserving it for the GPU so you might check for any settings
related to graphics memory). The kernel can only use whatever memory the
BIOS tells it can be used, so there's not anything that can be done in
the kernel. Therefore I'm closing this as invalid.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/812499
Title:
Just 2,8 of 4 GB RAM shown by Ubuntu.
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