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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

This issue would happen when user is using the "Mirrored Displays" with an external monitor.
The screen display will be set to 1280*720, causing this issue.

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https://bugs.launchpad.net/bugs/1334953

Title:
  [HP 15 Touchsmart] AMD Radeon HD 8400[1002:9830] ghost image appears
  with specific resolutions

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  CID: 201310-14248 HP 15 Touchsmart

  There are 5 resolution options available:
  1366 * 768
  1280 * 720
  1152 * 768
  1024 * 768
  800 * 600

  When using the open-source video driver, the 1280 * 720 and 1152 * 768 resolution does not work well with it, there will be some ghost images.
  Screenshot captured by the Screenshot program looks good. But it looks bad with human eyes, see attachment for the photo.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-30-generic 3.13.0-30.54
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1649 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1649 F.... pulseaudio
  CRDA:
   country TW:
    (2402 - 2472 @ 40), (3, 27)
    (5270 - 5330 @ 40), (3, 17), DFS
    (5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Fri Jun 27 00:06:15 2014
  HibernationDevice: RESUME=UUID=540104b4-4be9-4245-8c53-2f8471e94cbb
  InstallationDate: Installed on 2014-06-26 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Hewlett-Packard HP 15 Notebook PC
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic.efi.signed root=UUID=61fbea42-9507-49b2-b9ad-b0050652e97e ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-30-generic N/A
   linux-backports-modules-3.13.0-30-generic  N/A
   linux-firmware                             1.127.4
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.09
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 2192
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 41.1A
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.09:bd12/06/2013:svnHewlett-Packard:pnHP15NotebookPC:pvr0887100200005E10000120000:rvnHewlett-Packard:rn2192:rvr41.1A:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP 15 Notebook PC
  dmi.product.version: 0887100200005E10000120000
  dmi.sys.vendor: Hewlett-Packard

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