From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751920Ab3ASQNT (ORCPT ); Sat, 19 Jan 2013 11:13:19 -0500 Received: from powered.by.root24.eu ([91.121.15.64]:37087 "EHLO Root24.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751498Ab3ASQNS (ORCPT ); Sat, 19 Jan 2013 11:13:18 -0500 Message-ID: <50FAC61A.9060503@ionic.de> Date: Sat, 19 Jan 2013 17:13:14 +0100 From: Mihai Moldovan User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 To: Daniel Vetter CC: LKML , David Woodhouse , intel-gfx , dri-devel Subject: Re: i915-related and general system freezes with specific kernel config // IOMMU References: <50F9DF53.4090601@ionic.de> In-Reply-To: X-Enigmail-Version: 1.5 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms070808070205080009040609" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms070808070205080009040609 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable * On 19.01.2013 02:27 PM, Daniel Vetter wrote: > You have a gen4.5 chipset which is known to be utterly broken for > IOMMU+intel gpu. Nice description for what I'm seeing. ;) After some more hours of uptime I'm inclined to say, that "intel_iommu=3D= off iommu=3Doff" fixes my random freezes as well. Alas, the USB and PCI(e) problems are still around, but I could test reco= mpiling 3.7.2 with Intel IOMMU turned off completely in the kernel config. Interestingly, my 3.0.2 kernel which worked fine for so long doesn't even= *have* support for VT-d/Intel IOMMU. This could explain why I wasn't bit by thos= e problems on all previous versions. > [...] and we've never added the proper > quirks. See https://bugzilla.kernel.org/show_bug.cgi?id=3D51921 for a > proposed patch to fix this (i.e. automatically set > intel_iommu=3Digfx_off for affected platfroms). Testing highly welcome.= =46rom a quick glance, I don't think this patch will work as-is, my PCI I= D 2e12 is missing. I'll add it to the relevant section. But even if it worked, I'd still have the "box freezes randomly" issue (m= ostly within 5 to 60 minutes of uptime). :( The only way to get rid of this is disabling Intel IOMMU as a whole via k= ernel parameters intel_iommu=3Doff iommu=3Doff. Anyway, I'll give it a try. 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