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[Michael Murphy <1266984@xxxxxxxxxxxxxxxxxx>]

I haven't tried any upstream kernels since I just automatically update
to the latest kernel in the Ubuntu Mainline PPA with a script. All 3.13
rc kernels and even the new 3.13-generic which is now in Trusty stable
repos have the crashing issues with my two Radeon HD 6800 machines. I
found that if I disable DPM by editing /etc/default/grub and adding
radeon.dpm=0 to CMDLINE_LINUX that the crashing stops, so it is
definitely related to issues with AMD's Dynamic Power Management feature
in kernel 3.13. Something broke between kernel 3.12 and 3.13 in regards
to DPM but I wouldn't know what.

** Summary changed:

- Kernel 3.13-rc7 [AMD Radeon HD 6800] System Crashes and Reboots
+ Kernel 3.13 [AMD DPM] Radeon HD 6800 Crashes and/or Hangs

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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.

  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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