New motherboard not detecting all memory

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I recently bought a new AMD FM2 motherboard[1] and coupled it with an AMD A4 APU. I put 2x2GB sticks of RAM in the board, and the UEFI bios detects both sticks and reports 4GB. Now, when I boot into a fresh install of Linux [2] only 1501MB is reported as available.

I was told this may be an ACPI problem, I have updated the motherboard to the latest BIOS revision which works. Could anyone shed any light on this, or where I should make a start in helping to debug the problem?

Kind Regards,
Jack.

[1] http://www.gigabyte.com/products/product-page.aspx?pid=4383&dl=#ov
[2] Linux mediaserver 3.9.7-1-ARCH #1 SMP PREEMPT Thu Jun 20 22:45:32 CEST 2013 x86_64 GNU/Linux


--

  Jack Mitchell (jack@xxxxxxxxxxx)
  Embedded Systems Engineer
  http://www.embed.me.uk

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