linux-kernel - Re: I915 driver locks up

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Message-ID: <4D125430.1020708@earthlink.net>
Date:	Wed, 22 Dec 2010 14:40:32 -0500
From:	Stephen Clark <sclark46@...thlink.net>
To:	sclark46@...thlink.net
CC:	Chris Wilson <chris@...is-wilson.co.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: I915 driver locks up

On 12/21/2010 11:16 AM, Stephen Clark wrote:
> On 12/19/2010 04:46 PM, Stephen Clark wrote:
>> On 12/19/2010 06:02 AM, Chris Wilson wrote:
>>> On Sat, 18 Dec 2010 18:32:49 -0500, Stephen 
>>> Clark<sclark46@...thlink.net>  wrote:
>>>> I had been using mesa-7.9.
>>>> I loaded mesa-7.10 similar results. There is no
>>>>
>>>> /sys/kernel/debug/dri/0/i915_error_state
>>>>
>>>> In fact there is nothing in the /sys/kernel/debug directory. Do I have
>>>> to enable
>>>> something.
>>> You need to "mount -tdebugfs debug /sys/kernel/debug".
>>>
>>>> With the later kernel - things are worse X becomes totally useless 
>>>> it looks
>>>> like my lcd panel lost horizontal sync. With the 2.6.25 kernel X is
>>>> still usable
>>>> this makes me think at least some of the problem is kernel related.
>>> 2.6.25 to present marks the transition between UMS and KMS, i.e. moving
>>> of the userspace modesetting code into the kernel. And that should not
>>> have regressed. Can you please, grab an intel_reg_dumper of the working
>>> setup and the lost-sync setup, and include a drm.debug=0xe dmesg 
>>> (i.e. add
>>> drm.debug=0xe to your boot commandline)?
>>>
>>>> With 2.6.37-rc6 and mesa 7.10 with hardware acceleration turned off 
>>>> in wine-
>>>>
>>>> Dec 18 18:01:50 joker4 yum[5244]: Updated: 
>>>> mesa-libGL-7.10-0.17.fc15.x86_64
>>>> Dec 18 18:01:52 joker4 yum[5244]: Updated: 
>>>> mesa-libGL-7.10-0.17.fc15.i686
>>>> Dec 18 18:01:54 joker4 yum[5244]: Updated: 
>>>> mesa-libGLU-7.10-0.17.fc15.x86_64
>>>> Dec 18 18:02:02 joker4 yum[5244]: Updated: 
>>>> mesa-dri-drivers-7.10-0.17.fc15.x86_6
>>>> 4
>>>> Dec 18 18:02:03 joker4 yum[5244]: Updated: 
>>>> mesa-libGLU-7.10-0.17.fc15.i686
>>>> Dec 18 18:02:11 joker4 yum[5244]: Updated: 
>>>> mesa-dri-drivers-7.10-0.17.fc15.i686
>>> Good, those drivers are recent enough that I should be able to use the
>>> error state to find the broken code.
>>> -Chris
>>>
>> Hi Chris,
>>
>> I emailed the information you requested, it was quite large, and 
>> haven't seen it show up on
>> LKML yet. Don't know if it is being blocked by the ML or not.
>>
>> Regards,
>> Steve
>>
> Hi Chris,
>
> Just wondering if you received what you needed from me. I still have 
> the info
> for the 2.6.37rc6 kernel that I haven't sent awaiting some kind of 
> acknowledgment that
> you received the initial info I send for the 2.6.35 kernel.
>
> Steve
>
Hi Chris,

Just wanted to say I downloaded the latest drm_fixes from Dave Airlie 
and tried them
on 2.6.37rc7 and got the same gpu hang with the screen tearing 
horizontally. I have
the the intel gpu dump and a cat of the i915_error_state. Together they 
are over
2 megabytes. Should I send them to you directly since they seem to big 
for the mailing
list.

Regards,
Steve

-- 

"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty
decreases."  (Thomas Jefferson)



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