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

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Message-ID: <86r4wobj6v.fsf@sumi.keithp.com>
Date:	Mon, 19 Mar 2012 10:21:28 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>,
	dri-devel@...ts.freedesktop.org
Cc:	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

<#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.

> 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.

-- 
keith.packard@...el.com
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