linux-kernel - Re: MTRR setup failure on Fujitsu Lifebook S761

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Date:	Fri, 26 Aug 2011 22:39:25 +0100
From:	Tony Vroon <tony@...x.net>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	yinghai@...nel.org
Subject: Re: MTRR setup failure on Fujitsu Lifebook S761

On Fri, 2011-08-26 at 14:29 -0700, Suresh Siddha wrote:
> And you seem to say, things were _little_ bit better by using a MTRR
> script. What do you mean by _little_ ?

Little in that scrolling in terminals seems to work better. A failure
mode where the mouse cursor refuses to move seems to occur less often.

> Do you still see the original issue of hangcheck timer elapsed and it
> is just that the MTRR warning from drm driver disappeared with your
> MTRR script?

Yes, the hangcheck timer checks still fire intermittently and graphics
performance is still hit & miss. There is a failure mode that I call the
Amiga loading screen where vertical lines appear that are all a pixel
wide and are continuously changing in colour.

The AGP aperture is exactly 256MB in the location that the DRM warning
complained about, so what I did with the script was an attempt to answer
its lament. It accept that it may be completely meaningless in practice.

Regards,
Tony V.

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