For those of you wondering what iommu=soft is:
https://www.kernel.org/doc/Documentation/x86/x86_64/boot-options.txt
AMD64 specific boot options
IOMMU (input/output memory management unit)
General iommu options:
off Don't initialize and use any kind of IOMMU.
noforce Don't force hardware IOMMU usage when it is not needed.
(default).
force Force the use of the hardware IOMMU even when it is
not actually needed (e.g. because < 3 GB memory).
soft Use software bounce buffering (SWIOTLB) (default for
Intel machines). This can be used to prevent the usage
of an available hardware IOMMU.
I used the workaround above and it worked.
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https://bugs.launchpad.net/bugs/1447267
Title:
Ubuntu 14.04 AMD64 MSI 970 Gaming USB3.0 does not work
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