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

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Date:	Thu, 12 Mar 2009 11:24:12 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Andreas Herrmann <andreas.herrmann3@....com>
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 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?

YH
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