linux-kernel - Re: Dell Studio 1536 needs pci=nocrs to boot.

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Date:	Fri, 6 Jan 2012 10:32:14 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Dave Jones <davej@...hat.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>, x86@...nel.org
Subject: Re: Dell Studio 1536 needs pci=nocrs to boot.

On Tue, Jan 3, 2012 at 11:00 AM, Dave Jones <davej@...hat.com> wrote:
> On Tue, Jan 03, 2012 at 10:55:00AM -0700, Bjorn Helgaas wrote:
>  > On Tue, Jan 3, 2012 at 10:30 AM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
>  > > On Sun, 1 Jan 2012 15:53:54 +0100
>  > > Ingo Molnar <mingo@...e.hu> wrote:
>  > >
>  > >>
>  > >> * Dave Jones <davej@...hat.com> wrote:
>  > >>
>  > >> > Some machines don't boot unless passed pci=nocrs.
>  > >> > (See https://bugzilla.redhat.com/show_bug.cgi?id=770308 for details of
>  > >> >   one report. Waiting on dmidecode output for others).
>  > >> >
>  > >> > Currently there is a DMI whitelist, even though the default is on.
>  > >> >
>  > >> > This patch extends that dmi list to add a blacklist to automatically
>  > >> > apply disable it when necessary.
>  > >> >
>  > >> > Signed-off-by: Dave Jones <davej@...hat.com>
>  > >>
>  > >> Acked-by: Ingo Molnar <mingo@...e.hu>
>  > >>
>  > >> Jesse, will you take this one?
>  > >
>  > > Yeah, I can take it.  Bjorn, any comment (I'll bounce over the
>  > > original)?
>  >
>  > This is a band-aid, and we'll have to extend the blacklist for other
>  > machines, but it's the best we have right now, so I think it's the
>  > right thing to do.
>  >
>  > It's probably the same as
>  > https://bugzilla.kernel.org/show_bug.cgi?id=31602 (Dell 1546) and
>  > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/647043
>
> There's at least one more dell (Seems that entire 'studio' product line
> is affected) that I'm waiting on DMI data from.
> Also a thinkpad that I have a patch pending for.

I think we should drop the Dell 1536 blacklist entry from this patch
(adding set_nouse_crs() itself is fine and may be needed for other
machines).

The patches here: https://lkml.org/lkml/2012/1/5/402 should cover the
Dell 1536 issue as well as the Dell 1546 and any others with the same
BIOS defect.

Bjorn
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