linux-kernel - RE: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start onX61s laptop

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Date:	Sat, 17 May 2008 09:02:32 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Theodore Tso" <tytso@....edu>
Cc:	<linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	<bugme-daemon@...zilla.kernel.org>, <airlied@...ux.ie>,
	"Barnes, Jesse" <jesse.barnes@...el.com>,
	"Packard, Keith" <keith.packard@...el.com>
Subject: RE: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server failed start onX61s laptop

 

>-----Original Message-----
>From: Theodore Tso [mailto:tytso@....edu] 
>Sent: Saturday, May 17, 2008 8:42 AM
>To: Pallipadi, Venkatesh
>Cc: linux-kernel@...r.kernel.org; Ingo Molnar; Siddha, Suresh 
>B; bugme-daemon@...zilla.kernel.org
>Subject: [Bug 10732] REGRESSION: 2.6.26-rc2-git4: X server 
>failed start onX61s laptop
>
>
>On Sat, May 17, 2008 at 06:21:18AM -0700, Pallipadi, Venkatesh wrote:
>> 
>> Can you please send the complete dmesg after X failure, with 
>patch here
>> and debugpat boot option.
>> http://www.ussg.iu.edu/hypermail/linux/kernel/0805.0/2657.html
>
>With debugpat enabled, the resulting dump that landed in
>/var/log/messages was something like 1.6 megabytes, so it totally
>overflowed the dmesg buffer.
>
>I've created a Bugzilla attachment of the bzip'ed messages 
>excerpt here:
>
>http://bugzilla.kernel.org/attachment.cgi?id=16174&action=view
>
>The patch above was only available in HTML-only mode (and I couldn't
>find Ingo's patch on lkml.org, so I had to reconstruct it, and then
>forward part it to 2.6.26-rc2-git5).  What I actually used can be
>found here:
>
>http://bugzilla.kernel.org/attachment.cgi?id=16173&action=view
>
>I'm not sure this will be helpful for you, but this should be
>completely trivial for you to reproduce; just use Ubuntu Gutsy on
>Intel Video based laptop, with a 2.6.26-rc2-git4 or more recent
>kernel, and watch it fail.  
>
>For me, I'll just locally revert commit 1c12c4cf since otherwise X
>becomes more-or-less unsuable.  (Getting used to 1024x768 after using
>a 1600x1200 display is one thing; 800x600 is quite another, and the
>performance using the VESA driver is quite abysmal.)
>

Thanks for the log Ted. From first looks, I don't see any PAT related
failures
in the log. And as the revert of the commit 1c12c4cf is fixing the
problem here,
adding the X guys to the thread.

I am thinking that may be X is depending on mprotect changes somehow and
failing when
it cannot change PAT attributes with mprotect call. Keith earlier
mentioned that X
will not depend on this. May be something to do with earlier X version.
Keith?

Thanks,
Venki
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