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Message-ID: <20080326102151.GB18965@elf.ucw.cz> Date: Wed, 26 Mar 2008 11:21:51 +0100 From: Pavel Machek <pavel@....cz> To: Andi Kleen <andi@...stfloor.org> Cc: Ingo Molnar <mingo@...e.hu>, kernel list <linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com> Subject: Re: iommu breaks usb after resume 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. I had: CONFIG_AGP=y CONFIG_AGP_AMD64=y CONFIG_AGP_INTEL=y # CONFIG_AGP_SIS is not set CONFIG_AGP_VIA=y CONFIG_DRM=y # CONFIG_DRM_TDFX is not set ...do I need to enable something more? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html pomozte zachranit klanovicky les: http://www.ujezdskystrom.info/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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