IOMMU Broken on 3.8 kernels?

[alphac]

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)

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1208297

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.11 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc4-saucy/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]