From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH] iommu/intel: disable DMAR for g4x integrated gfx Date: Mon, 21 Jan 2013 13:03:48 -0600 Message-ID: <1358795028.5523.6.camel@shinybook.infradead.org> References: <1358722213-2075-1-git-send-email-daniel.vetter@ffwll.ch> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-Mi6T1Vbse15QGkAaoq8g" Return-path: In-Reply-To: <1358722213-2075-1-git-send-email-daniel.vetter@ffwll.ch> Sender: stable-owner@vger.kernel.org To: Daniel Vetter , "Sankaran, Rajesh" Cc: Intel Graphics Development , DRI Development , LKML , Adam Jackson , stable@vger.kernel.org List-Id: intel-gfx@lists.freedesktop.org --=-Mi6T1Vbse15QGkAaoq8g Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2013-01-20 at 23:50 +0100, Daniel Vetter wrote: > DMAR support on g4x/gm45 integrated gpus seems to be totally busted. > So don't bother, but instead disable it by default to allow distros to > unconditionally enable DMAR support. Acked-By: David Woodhouse It *really* winds me up that we never bother to test this hardware before we ship it. But I'm even *more* disappointed that we can't even diagnose it and publish coherent errata *after* the fact. I'd really like to see each quirk which disables features referencing a specific published erratum. We really ought to be able to manage at least *that* much. 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