linux-kernel - Re: [PATCH] x86: mtrr: don't modify RdDram/WrDram bits of fixed MTRRs

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Date:	Fri, 13 Mar 2009 10:06:50 +0100
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	trenn@...e.de
Subject: Re: [PATCH] x86: mtrr: don't modify RdDram/WrDram bits of fixed
	MTRRs

On Thu, Mar 12, 2009 at 11:24:12AM -0700, Yinghai Lu wrote:
> On Thu, Mar 12, 2009 at 4:41 AM, Andreas Herrmann
> <andreas.herrmann3@....com> wrote:
> > On Thu, Mar 12, 2009 at 01:01:26AM -0700, Yinghai Lu wrote:
> >> wonder if you could add one dmi check to tell the user that bios is
> >> buggy, ask vendor fixed BIOS
> >> and skip fixed mtrr sync.
> >
> > There seem to be several systems affected that do not hide
> > RdMem/WrMem bits from OS.
> >
> >  (Causing Suspend/resume problem:)
> > - Acer Ferrari 1000
> > - Acer Ferrari 5000
> >  (Causing kernel freeze:)
> > - Asus M51TR-AP003C notebook
> > - Asus M51Ta notebook
> > - Asus M3A-H/HDMI mobo
> 
> they didn't run bios testsuite or bios testsuite miss that checking?

Don't know. I'll try to figure that out.

Andreas

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