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Subject: Re: [Linux 2.6.29-rc6] [drm:i915_set_status_page] *ERROR* can not 
	ioremap virtual address for G33 hw status page
From: Yinghai Lu <yinghai@kernel.org>
To: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Eric Anholt <eric@anholt.net>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>,
       "lenb@kernel.org" <lenb@kernel.org>, Ingo Molnar <mingo@elte.hu>,
       mjg@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
       rui.zhang@intel.com, airlied@redhat.com
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On Mon, Feb 23, 2009 at 1:40 PM, Maciej Rutecki
<maciej.rutecki@gmail.com> wrote:
> 2009/2/23 Rafael J. Wysocki <rjw@sisk.pl>:
>
>>
>> This is a serious regression on this particular hardware, though.  We need it
>> fixed before 2.6.29-final, this way or another.
>
> root@zlom:/usr/src/git/linux-2.6# git bisect bad
> 6fb88588555a18792a27f483887fe1f2af5f9c9b is first bad commit
> commit 6fb88588555a18792a27f483887fe1f2af5f9c9b
> Author: Jesse Barnes <jbarnes@virtuousgeek.org>
> Date:   Mon Feb 23 10:08:21 2009 +1000
>
>    drm/i915: fix WC mapping in non-GEM i915 code.
>
>    [airlied - taken from mailing list posting]
>
>    Signed-off-by: Dave Airlie <airlied@redhat.com>
>
> :040000 040000 94fbea685d2937dbe9f3ef861283724262d8443f
> 451872e14d914a3457adf9c144a705b646d887b4 M      drivers
>
> Revert this commit helps, and Xwindow works, still (like in previous
> -rc*) I have this message:
> [   16.897361] mtrr: type mismatch for d0000000,10000000 old:
> write-back new: write-combining
> [   16.897369] [drm] MTRR allocation failed
> [   16.897371] .  Graphics performance may suffer.
> [   16.897401] pci 0000:00:02.0: irq 27 for MSI/MSI-X
> [   16.897432] [drm] Initialized i915 1.6.0 20080730 on minor 0
> [   16.931100] mtrr: type mismatch for d0000000,10000000 old:
> write-back new: write-combining
> [   17.397378] set status page addr 0x00043000

CONFIG_MTRR=y
CONFIG_MTRR_SANITIZER=y
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1

should help mtrr ones.

please post bootlog with those option set.

YH