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[alphac <1208297@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I've got an Asrock A75Pro4-M, after enabling IOMMU from BIOS running with kernel 3.2.0-29-generic dmesg reported iommu correctly working:
[    0.518415] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 extended features:  PreF PPR GT IA
[    0.518479] AMD-Vi: Initialized for Passthrough Mode

Now with kernel 3.8.0-27 :
"AMD IOMMUv2 functionality not available on this system"

No more lines referring to IOMMU v1, is that a common behaviour?

Thanks

P.S. "ubuntu-bug linux" states that my current image file does not
comes from an offical package (not true)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: precise

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https://bugs.launchpad.net/bugs/1208297

Title:
  IOMMU Broken on 3.8 kernels?

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I've got an Asrock A75Pro4-M, after enabling IOMMU from BIOS running with kernel 3.2.0-29-generic dmesg reported iommu correctly working:
  [    0.518415] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 extended features:  PreF PPR GT IA
  [    0.518479] AMD-Vi: Initialized for Passthrough Mode

  Now with kernel 3.8.0-27 :
  "AMD IOMMUv2 functionality not available on this system"

  No more lines referring to IOMMU v1, is that a common behaviour?

  Thanks

  P.S. "ubuntu-bug linux" states that my current image file does not
  comes from an offical package (not true)

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