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Old 11-23-11, 08:49 AM   #1
jeisom
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Default amd_iommu and nvidia driver

I got a M5A97 EVO. If I turn on the IOMMU in UEFI settings X hangs at start up of X. Also when I reboot USB no longer functions in linux after loading X with the nvidia driver. USB works fine in grub and the UEFI settings. I am just using linux on the "bare metal". I tested 285.05.09 and 290.06 and 290.10. attached is nvidia-bug-report.log.gz from 290.06.

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Jonathan
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Old 12-04-11, 01:05 PM   #2
trapxvi
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Default Re: amd_iommu and nvidia driver

Try booting your kernel with "iommu=pt" or if that fails to work "iommu=soft" to disable the isolation features of your IOMMU. The former is required for me (2x SLI GTX 560 Ti, 290.10, 3.1.0) to use BaseMosaic for triple head or VDPAU in any configuration. I suspect that Nvidia's kernel module doesn't give the device's proper access to perform necessary DMA operations. Disabling it or not initializing it for address space isolation works around this issue.
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Old 12-05-11, 11:39 AM   #3
zander
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Default Re: amd_iommu and nvidia driver

Quote:
Originally Posted by trapxvi View Post
Try booting your kernel with "iommu=pt" or if that fails to work "iommu=soft" to disable the isolation features of your IOMMU. The former is required for me (2x SLI GTX 560 Ti, 290.10, 3.1.0) to use BaseMosaic for triple head or VDPAU in any configuration. I suspect that Nvidia's kernel module doesn't give the device's proper access to perform necessary DMA operations. Disabling it or not initializing it for address space isolation works around this issue.
It does in non-SLI configurations, but due to a limitation, the driver currently fails to set up IOMMU mappings correctly for all GPUs in an SLI configuration.
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Old 12-05-11, 11:50 AM   #4
jeisom
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Default Re: amd_iommu and nvidia driver

Booting with "iommu=pt" works. Not using SLI either.

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