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[Michael Murphy <1266984@xxxxxxxxxxxxxxxxxx>]

Kernel 3.14-rc1 has fixed DPM with my Radeon HD 6850 and AMD A8-6600K
machines.

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https://bugs.launchpad.net/bugs/1266984

Title:
  Kernel 3.13 [AMD DPM] Radeon HD 6800 Crashes and/or Hangs

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Using the latest 3.13-rc7 on two of my AMD machines, both of which
  have Radeon HD 6850 graphics cards in them, the system crashes when
  playing videos. I think it may be easier to cause the crash when
  playing a video that is 720p+. It also is not limited to crashing when
  playing videos, but can also crash simply from browsing the web or
  doing anything that causes a demand on the GPU. It may or may not be
  related to DPM implemented in the latest kernels. Using kernel 3.12
  from Trusty repos with DPM enabled, it works fine. I have a machine
  with a Radeon HD 7950 but I have not tested it yet. Similarly, I have
  used an AMD Richland APU which crashes with kernel 3.13 immediately on
  the login screen. Put simply, there needs to be a lot of testing of
  AMD chips before releasing kernel 3.13 for Trusty stable.

  WORKAROUND: I found that if I disable DPM by editing /etc/default/grub
  and adding radeon.dpm=0 to CMDLINE_LINUX that the crashing stops.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.12.0-7-generic 3.12.0-7.15
  ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
  Uname: Linux 3.12.0-7-generic x86_64
  ApportVersion: 2.12.7-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ching      2397 F.... pulseaudio
   /dev/snd/controlC0:  ching      2397 F.... pulseaudio
  CRDA:
   country AU:
    (2402 - 2482 @ 40), (N/A, 20)
    (5170 - 5250 @ 40), (3, 23)
    (5250 - 5330 @ 40), (3, 23), DFS
    (5735 - 5835 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Tue Jan  7 23:50:13 2014
  HibernationDevice: RESUME=UUID=39d467a4-e793-46df-9a88-10813a999704
  MachineType: System manufacturer System Product Name
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-7-generic root=UUID=1533ba1d-4ff6-4974-839f-5074ef65a6f1 ro splash quiet radeon.audio=1 radeon.dpm=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-7-generic N/A
   linux-backports-modules-3.12.0-7-generic  N/A
   linux-firmware                            1.119
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/13/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3503
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A78T-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3503:bd04/13/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78T-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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