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[Goran Obal <goran_obal@xxxxxxxx>]

Lars, is this improvement just after going from 14.04 to 14.10 or did
you try adding radeon.dpm=1 to grub?

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https://bugs.launchpad.net/bugs/1304912

Title:
  Ubuntu 14.04 laptop uses lot of power switchable graphics

Status in xserver-xorg-video-ati package in Ubuntu:
  Confirmed

Bug description:
  I have a Samsung Series 7 Chronos 700Z3A-S02DE. It uses an i5-2450m
  (Intel HD3000) and an AMD 6490m dedicated graphics card. Since Ubuntu
  14.04 uses Linux kernel 3.13 it enables dpm by default. This causes
  the graphics card to be shut down to dynoff when not used and should
  make it use (almost) no power.

  However, the laptop fans are working all the time and the laptop
  produces quite a lot of noise (the CPU does not heat as sensors are at
  60°C). The sensor for the graphcis card always shows -128°C.

  Using powertop it reveals that the laptop consumes around 34W on
  battery. Looking on the list where the usage is shown per device it
  shows the radeon graphics card with 0%.

  I think there is a bug and the graphics card is NOT shutdown correctly
  to not use any noticable power.

  I would appreciate if I can help you to find the issue and if you need any more information.
  ---
  .tmp.unity.support.test.0:

  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 6.30.223.141+bdcom, 3.13.0-20-generic, x86_64: installed
   bcmwl, 6.30.223.141+bdcom, 3.13.0-21-generic, x86_64: installed
   bcmwl, 6.30.223.141+bdcom, 3.13.0-23-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Samsung Electronics Co Ltd Device [144d:c0b3]
   Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] [1002:6760] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2014-04-01 (7 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140331)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 700Z3A/700Z4A/700Z5A/700Z5B
  Package: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.14.0-031400-generic root=UUID=61e915cb-08a0-4dde-9067-e21c55686387 ro quiet splash vt.handoff=7
  Tags:  trusty ubuntu compiz-0.9
  Uname: Linux 3.14.0-031400-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 11/06/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 15FD
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 700Z3A/700Z4A/700Z5A/700Z5B
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr15FD:bd11/06/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn700Z3A/700Z4A/700Z5A/700Z5B:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn700Z3A/700Z4A/700Z5A/700Z5B:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 700Z3A/700Z4A/700Z5A/700Z5B
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  version.compiz: compiz 1:0.9.11+14.04.20140404-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed Apr  9 10:44:25 2014
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.15.0-1ubuntu7

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