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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Sorry for the delay, I was away for a few days.  Thanks for testing that
kernel.  I'll have to investigate the set of iommu/amd patches further.

The v3.11-rc4 kernel is now out.  Can you also test this kernel, just to see if the bug is already fixed in mainline?
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc4-saucy/

Thanks again for all  your help!

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https://bugs.launchpad.net/bugs/1159219

Title:
  Ubuntu Raring , IOMMU, fails to boot

Status in “linux” package in Ubuntu:
  Triaged
Status in “linux” source package in Raring:
  New

Bug description:
  My system, Ubuntu 13.04, at boot, it drops to busybox if i have AMD IOMMU enabled in BIOS.
  If i have the option enabled then the system only boots with a kernel version  <= 3.6.
  I have tried all the kernels from Ubuntu Kernel Mainline, 3.8.4 included. 

  The error that it throws during boot, it is:
     AMD-VI: Event logged.. INVALID DEVICE REQUEST
  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-13-generic 3.8.0-13.23
  ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
  Uname: Linux 3.8.0-13-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.9.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mdalacu    2411 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Sat Mar 23 21:39:49 2013
  InstallationDate: Installed on 2010-10-18 (886 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-13-generic root=UUID=d17fe8b8-a39b-48b6-991a-ea7e7c7a230d ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-13-generic N/A
   linux-backports-modules-3.8.0-13-generic  N/A
   linux-firmware                            1.104
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-03-13 (9 days ago)
  dmi.bios.date: 01/09/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.70
  dmi.board.name: 890FX Deluxe4
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.70:bd01/09/2012:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn890FXDeluxe4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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