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Date: Fri, 1 Nov 2013 14:21:07 +0100 From: Peter Senna Tschudin <peter.senna@...il.com> To: Joerg Roedel <joro@...tes.org> Cc: iommu@...ts.linux-foundation.org, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, Seiji Aguchi <seiji.aguchi@....com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: Re: VT-d and x2apic: broken resume after suspend to ram On Fri, Nov 1, 2013 at 2:07 PM, Joerg Roedel <joro@...tes.org> wrote: > Hi Peter, > > On Fri, Nov 01, 2013 at 01:37:36PM +0100, Peter Senna Tschudin wrote: >> I have one notebook that is failing to resume after suspend to ram. >> I've filled a bug report back on the 2.6.41 days: >> >> https://bugzilla.redhat.com/show_bug.cgi?id=787299 >> >> The issue is that trying to resume after suspending to ram freezes the >> computer. The resume starts well, but then it hangs. >> >> Yesterday I found that this may be related to VT-d / x2apic. If I >> disable VT-d on the BIOS, suspend / resume works fine. If I enable >> VT-d and pass nox2apic as boot parameter to Kernel suspend and resume >> works fine. I would like some pointers to fix this issue. Can you help >> me? >> >> Only when I have VT-d enabled, dmesg gives me additional output: >> [ 0.023913] IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 >> [ 0.024080] Enabled IRQ remapping in x2apic mode >> [ 0.024081] Enabling x2apic >> [ 0.024082] Enabled x2apic >> [ 0.024087] Switched APIC routing to cluster x2apic. >> >> The notebook is Toshiba R830-10p with i7-2620M. > > Which kernels have you tried? Does it happen with all of them or is > there a kernel-version where this started? I'm using 3.11.6-200.fc19.x86_64. I always had VT-d enabled, and suspend / resume never worked on Linux. I did not know that disabling VT-d could be a workaround to the resume issue until yesterday. Does this have anything in common to: https://bugzilla.redhat.com/show_bug.cgi?id=752613 > > > Joerg > > -- Peter -- 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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