linux-kernel - Re: 2.6.28-rc1: [drm:i915] *ERROR* ... Disabling tiling

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Date:	Mon, 23 Mar 2009 09:52:15 +0000
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	Eric Anholt <eric@...olt.net>
Cc:	dri-devel@...ts.sourceforge.net,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc1: [drm:i915] *ERROR* ... Disabling tiling

On 3/23/09, Alan Jenkins <sourcejedi.lkml@...glemail.com> wrote:
> On 10/27/08, Eric Anholt <eric@...olt.net> wrote:
>> On Mon, 2008-10-27 at 14:27 +0000, Alan Jenkins wrote:
>>> What does this mean, should I do anything about it?  Is tiling nice to
>>> have?
>>>
>>> It sounds like GEM broke something - though maybe it just added a more
>>> verbose error report.
>>>
>>> System: EeePC 701
>>> Kernel: v2.6.28-rc1-5-g23cf24c
>>> Chipset: Intel mobile 915G-something
>>> Regretably necessary kernel boot option: noapic
>>>
>>>
>>> [    1.438441] Linux agpgart interface v0.103
>>> [    1.438441] agpgart-intel 0000:00:00.0: Intel 915GM Chipset
>>> [    1.438441] agpgart-intel 0000:00:00.0: detected 7932K stolen memory
>>> [    1.443353] agpgart-intel 0000:00:00.0: AGP aperture is 256M @
>>> 0xd0000000
>>> [    1.443353] [drm] Initialized drm 1.1.0 20060810
>>> [    1.443353] pci 0000:00:02.0: PCI INT A -> Link[LNKA] -> GSI 5
>>> (level, low) -> IRQ 5
>>> [    1.443353] pci 0000:00:02.0: setting latency timer to 64
>>> [    1.443353] [drm:i915_gem_detect_bit_6_swizzle] *ERROR* Couldn't read
>>> from MCHBAR.  Disabling
>>> tiling.
>>
>> This means that something went wrong with our detection of the
>> CPU-versus-GPU tiling swizzling mode, and object tiling under GEM will
>> be disabled as a result.  I should get access to an eee 7xx on Thursday
>> to see what's up with it -- it's supposed to be just a normal 915gm as
>> far as I know.
>
> Any news about this tiling error?
>
> It's already been reported as a bug in Ubuntu Jaunty, in the belief
> that it "reduces video performance" [1], and is also mentioned on a
> similar bug in Fedora [2].
>
> [1] <https://bugzilla.redhat.com/show_bug.cgi?id=444328#c37>
> [2]
> <https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/329266>

Ah, I should also mention that I still see the error on the latest RC,
2.6.29-rc8.

Alan
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