Q:Could you please go into the bios and make sure the IOMMU option is
set?

A: Yes and no.

I went into BIOS and looked for IOMMU(and other entries like MMU) ->
nothing.

A internet search has shown me so far that IOMMU is not common on AMD
chipsets.

A summary of the chipset capabilities can be found here:

http://en.wikipedia.org/wiki/Comparison_of_AMD_chipsets

You can see that there are only IOMMU entries for chipset version >=970.
Together with the circumstance that to my 760G chipset is absolutely
nothing to find(internet search >2h) about IOMMU I would say that my
hardware is not capable of IOMMU.

This article says that also some 8xx chipsets should have IOMMU:

http://www.dailytech.com/AMD+to+Add+IOMMU+Support+to+Chipsets+in+2009/article11192.htm

I have also checked the BIOS version which is 1.8 on my sytem. The MSI
availabe verision is 1.10. It is a bit tricky to thing over updating
when the probability is high that also the update will change nothing.

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https://bugs.launchpad.net/bugs/985579

Title:
  attaching PCI-E HD Radeon 6450 graphic card to Ubuntu12.04 64bit guest
  fails

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