Comment 82 for bug 1428121
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#82 |
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f33e652
(Get the code!)
I'm confused by the IOMMU aspect of this. Surely the DMA for the *audio* will still from from the HD Audio controller, not from the graphics device? So turning off the IOMMU from the graphics device really shouldn't make any difference?
And if there's some mixup in hardware and the DMA transactions are actually happening with the PCI source-id of the graphics device instead of the HD audio controller... then we should see *faults*. But we don't; instead the DMA just silently fails?
How is the integration between the graphics and audio devices supposed to work?