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Date: Wed, 18 Feb 2009 11:33:57 -0800
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Subject: Re: i915 regression in 2.6.29-rc5
From: Yinghai Lu <yinghai@kernel.org>
To: ZhangRui <rui.zhang@intel.com>, Ingo Molnar <mingo@elte.hu>
Cc: dri_devel@lists.sourceforge.net, LKML <linux-kernel@vger.kernel.org>,
       jbarnes@virtuousgeek.org, "Rafael J. Wysocki" <rjw@sisk.pl>
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On Tue, Feb 17, 2009 at 7:24 PM, ZhangRui <rui.zhang@intel.com> wrote:
> Hi, all,
>
> I got an i915 failure in 2.6.29-rc5.
>
> problem description: the screen doesn't come back after suspend/resume.
> A workaround is to boot with "nomodesetting".
>
> I got this error message during i915 driver load time,
> [   22.606749] mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining
> [   22.606752] [drm] MTRR allocation failed
> [   22.606753] .  Graphics performance may suffer.

CONFIG_MTRR_SANITIZER=y
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1

may help this one.

YH