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

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Date:	Mon, 27 Oct 2008 15:12:08 +0000
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	dri-devel@...ts.sourceforge.net
CC:	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

Alan Jenkins wrote:
> 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: v2.6.36-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.

There's no obvious difference in Xorg.log (compared to 2.6.27).  In fact 
it claims to have successfuly enabled tiling.

(**) intel(0): Tiling enabled
(II) intel(0): Attempting memory allocation with tiled buffers.
(II) intel(0): Success.

So these new kernel error messages seem a bit random.

Thanks
Alan
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