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[RichardNeill <ubuntu@xxxxxxxxxxxxxxxx>]

Dear Christopher,

Thanks for your suggestion.  I've done a few more experiments before and
after updating the BIOS (to the latest version  (4105   07/01/2013).
Here are the results.

1. Old Bios.  Mageia 3  + Fglrx driver
=> Worked fine

2. Old Bios,  Kubuntu Trusty (installed yesterday, fully updated),  Open-source (Radeon) driver.
=> No CPU hang.
However,  I did have a problem with video-modelines being auto-detected wrongly, (resulting in the monitors showing out-of range. I've since fixed that manually with xrandr --addmode and will shortly file a bug on it, but this is what set me off on the path of trying the binary drivers).

3. Old Bios, Trusty,  and the fglrx driver 
(both fglrx and fglrx-update, as per https://help.ubuntu.com/community/BinaryDriverHowto/AMD )
=> CPIU hang.

4. Old Bios, Utopic alpha, and open-source driver
=> No cpu hang   (but the modeline problem still present)

5. New Bios, Utopic, open-source driver
=> No cpu hang   (but the modeline problem still present)

6. New Bios, Utopic, fglrx
CPU hang again (see dmesg attached)

Best wishes

Richard

** Attachment added: "Dmesg output"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338177/+attachment/4147183/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1338177

Title:
  BUG: soft lockup - CPU#0 stuck for 23s! [Xorg:1295]

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I've just installed Utopic, and my machine is really slow to boot.

  ProblemType: KernelOops
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.15.0-6-generic 3.15.0-6.11 [modified: boot/vmlinuz-3.15.0-6-generic]
  ProcVersionSignature: Ubuntu 3.15.0-6.11-generic 3.15.0
  Uname: Linux 3.15.0-6-generic x86_64
  Annotation: Your system might become unstable now and might need to be restarted.
  ApportVersion: 2.14.4-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  rjn        2642 F.... pulseaudio
   /dev/snd/controlC2:  rjn        2642 F.... pulseaudio
   /dev/snd/controlC0:  rjn        2642 F.... pulseaudio
   /dev/snd/controlC1:  rjn        2642 F.... pulseaudio
  Date: Sun Jul  6 00:58:31 2014
  DuplicateSignature: BUG: soft lockup - CPU#0 stuck for 23s! [Xorg:1295] RIP: 0010:location  location ulReadMmRegisterUlongViaAddr+0xc/0x10 [fglrx]
  Failure: oops
  HibernationDevice: RESUME=UUID=dd46a6f0-bcb8-4e75-b77d-6158117027ac
  InstallationDate: Installed on 2014-07-05 (0 days ago)
  InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140703)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.15.0-6-generic root=UUID=41c3bf4e-49c3-4546-aea6-30a91309679d ro
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions: kerneloops-daemon 0.12+git20090217-3ubuntu8
  RfKill:
   
  SourcePackage: linux
  Title: BUG: soft lockup - CPU#0 stuck for 23s! [Xorg:1295]
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/21/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0703
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V LX
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0703:bd10/21/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VLX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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