From owner-freebsd-questions@FreeBSD.ORG  Fri Aug 27 15:44:00 2010
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Date: Fri, 27 Aug 2010 08:43:58 -0700
From: Rem P Roberti <remegius@comcast.net>
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To: Tijl Coosemans <tijl@coosemans.org>
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Subject: Re: Panic or deadlock with Intel graphics
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  On 08/27/10 03:12, Tijl Coosemans wrote:
> On Thursday 26 August 2010 05:55:42 Rem P Roberti wrote:
>> In an attempt to diagnose why my Thinkpad R51 completely locks up when
>> trying to access X I have done the following.  I built a debugging
>> kernel, with KDB, DDB, WITNESS, INVARIANT*, AND DIAGNOSTIC in addition
>> to *BREAK_TO_DEBUGGER.  None of these things have yielded any progress
>> in isolating the issue.  Note that replacing the 'intel' driver with the
>> 'vesa' driver in /etc/X11/xorg.conf does not cause the computer to
>> hang.  The problem appears to be specific to the intel driver.  Also, I
>> have been unable to get a crash report (which is what we were hoping to
>> see in /var/crash) regardless of the debugging options built into the
>> kernel.
>>
>> I have attached the output of 'uname -a', 'dmesg', and 'pciconf -lv' to
>> this post.
> It could be related to DRI, so try to disable it in /etc/X11/xorg.conf:
>
> Section "Module"
>          Disable  "dri"
>          Disable  "dri2"
> EndSection

Unfortunately, that did not work.

Cheers...