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[Alex Hung <1434014@xxxxxxxxxxxxxxxxxx>]

dmesg in #4 shows memory map as below:

e820: BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x000000000009dfff] usable
BIOS-e820: [mem 0x000000000009e000-0x000000000009ffff] reserved
BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
BIOS-e820: [mem 0x0000000000100000-0x00000000a5de3fff] usable
BIOS-e820: [mem 0x00000000a5de4000-0x00000000ae385fff] reserved
BIOS-e820: [mem 0x00000000ae386000-0x00000000ae4a5fff] ACPI NVS
BIOS-e820: [mem 0x00000000ae4a6000-0x00000000ae525fff] ACPI data
BIOS-e820: [mem 0x00000000ae526000-0x00000000afffffff] reserved
BIOS-e820: [mem 0x00000000fec00000-0x00000000fecfffff] reserved
BIOS-e820: [mem 0x00000000fed80000-0x00000000fed80fff] reserved
BIOS-e820: [mem 0x00000000ff800000-0x00000000ffffffff] reserved
BIOS-e820: [mem 0x0000000100000000-0x000000012effffff] usable

It is seen that memory 4gb is declared so there is nothing wrong with it.
    BIOS-e820: [mem 0x0000000100000000-0x000000012effffff] usable

The usable memory is allocated in the below two ranges:
     BIOS-e820: [mem 0x0000000000100000-0x00000000a5de3fff] usable
     BIOS-e820: [mem 0x0000000100000000-0x000000012effffff] usable

The range between fec00000~b000000 is not declared (see below) - that's more 1GB memory space (note: not actual memory). It is not certain whether actual memory is mapped there but used elsewhere (ex. for as VGA memory) but BIOS forgot to allocate it.
    BIOS-e820: [mem 0x00000000ae526000-0x00000000afffffff] reserved
    BIOS-e820: [mem 0x00000000fec00000-0x00000000fecfffff] reserved

This may need attention or confirmation from OEM and perhaps they can
provide a BIOS update.

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https://bugs.launchpad.net/bugs/1434014

Title:
  [Lenovo E450] Run test case 'memory/info' is failed.

Status in HWE Next Project:
  Incomplete
Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  CID : 201407-15368 Lenovo E450 (A+A) with 14.04.2 (utopic)

  Steps:
  1. Install 14.04.2 on E450
  2. Install Plainbox and run test case 'memory/info'. (This test checks the amount of memory which is reporting in meminfo against the size of the memory modules detected by DMI.)

  Expected result:
  Test result should be pass.

  Actual result:

   /proc/meminfo reports:	3.13GiB
   lshw reports:	4GiB

  FAIL: Meminfo reports 930258944 less than lshw, a difference of
  21.66%. Only a variance of 20% in reported memory is allowed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar 19 06:28:49 2015
  InstallationDate: Installed on 2015-03-18 (1 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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