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

From: Pallipadi, Venkatesh
Date: Sat May 17 2008 - 12:00:43 EST

>-----Original Message-----
>From: Theodore Tso [mailto:tytso@xxxxxxx]
>Sent: Saturday, May 17, 2008 8:42 AM
>To: Pallipadi, Venkatesh
>Cc: linux-kernel@xxxxxxxxxxxxxxx; Ingo Molnar; Siddha, Suresh
>B; bugme-daemon@xxxxxxxxxxxxxxxxxxx
>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.
>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:
>The patch above was only available in HTML-only mode (and I couldn't
>find Ingo's patch on, 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:
>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
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.

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