linux-kernel - Re: hibernate random memory corruption, workaround i915.modeset=0

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Date:	Wed, 21 Mar 2012 15:43:45 +0000
From:	Dave Airlie <airlied@...il.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Keith Packard <keithp@...thp.com>, dri-devel@...ts.freedesktop.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Airlie <airlied@...ux.ie>, rjw@...k.pl, davej@...hat.com
Subject: Re: hibernate random memory corruption, workaround i915.modeset=0

On Wed, Mar 21, 2012 at 3:14 PM, Stanislaw Gruszka <sgruszka@...hat.com> wrote:
> On Mon, Mar 19, 2012 at 10:21:28AM -0700, Keith Packard wrote:
>> <#part sign=pgpmime>
>> On Mon, 19 Mar 2012 15:53:54 +0100, Stanislaw Gruszka <sgruszka@...hat.com> wrote:
>>
>> > Keith, is there a chance that this bug can be fixed by i915 team?
>>
>> Yes, I'm working on figuring out how to actually reproduce this and then
>> work on a few work-arounds.
>
> This must be hardware dependent then, yesterday and today I tried to
> reproduce on Lenovo T60 with:
>
> 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
>
> and there is no sign of corruption, I double checked if slab poisoning
> is enabled.
>
>> > If not, can we disable hibernate on i915 with modeset=1 and add
>> > module option, which enable it for those who want to risk?
>>
>> I'd love to know if disabling modeset on just the booting kernel helps;
>> leaving the resuming kernel with modeset=1. I haven't been able to
>> reproduce this locally yet to test this theory though.
>
> On Lenovo T500 with:
>
> 00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)

I also did a bunch of tests on my 965GM and it didn't die,

so it might be its a GM45 and Ironlake at least.

Dave.
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