Messages in this thread | | | Date | Fri, 21 Mar 2008 14:54:18 +0100 | From | Andi Kleen <> | Subject | Re: iommu breaks usb after resume |
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On Thu, Mar 20, 2008 at 12:14:29PM +0100, Pavel Machek wrote: > Hi! > > On 64-bit machine with 4GB ram (8core from amd), iommu breaks USB > after swsusp. iommu=soft fixes that issue. > > I guess iommu handling in arch/x86/kernel/ should have some > suspend/resume support, as it manipulates hardware registers...?
AGP suspend/resume should already handle restoring of the aperture and the IOMMU code uses the same. It has not other state. It might not work when the AGP driver is not compiled in/loaded though (I suspect that is what happened to you) One simple fix would be to just enforce that in Kconfig when suspend/resume is enabled.
-Andi
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