linux-kernel - RE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel and VESA framebuffer

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Date:	Fri, 12 Sep 2008 09:05:02 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Frans Pop <elendil@...net.nl>
CC:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>
Subject: RE: [Bug 10843] Display artifacts on XOrg logout with PAT kernel
 and VESA framebuffer



>-----Original Message-----
>From: Frans Pop [mailto:elendil@...net.nl]
>Sent: Friday, September 12, 2008 6:34 AM
>To: Pallipadi, Venkatesh
>Cc: Siddha, Suresh B; Linux Kernel Mailing List; Ingo Molnar;
>arjan@...ux.intel.com; jbarnes@...tuousgeek.org
>Subject: Re: [Bug 10843] Display artifacts on XOrg logout with
>PAT kernel and VESA framebuffer
>
>On Friday 12 September 2008, Pallipadi, Venkatesh wrote:
>> What does the output of x86/pat_memtype_list under debugfs look like?
>
>I've attached that file and dmesg output for two of the machines.
>

OK. This is the same issue as the one on this thread here
http://www.ussg.iu.edu/hypermail/linux/kernel/0808.2/1532.html


We have too many entires in PAT list due to RAM pages being marked
UC by drivers. Unfortunately, there are no quick fixes that can fix
this for 2.6.27. However, we are aware of the problem here and
working on a more complete fix for this. We should have the patch
for it soon.

Thanks,
Venki
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