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

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Date:	Mon, 27 Oct 2008 14:59:28 +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:
> 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.
> [    1.443353] [drm:i915_driver_load] *ERROR* failed to enable MSI
>
>
> I expect noapic explains the MSI failure.  I can boot without noapic if 
> necessary for testing, but I can't run with it because I get nasty hangs 
> & reboots.  I don't see why that merits an *ERROR*... anyway, what I'm 
> interested in is the "Disabling tiling".
>   

Actually... MSI does seem to be working for my ethernet.

$ grep eth /proc/interrupts
 44:       2446   PCI-MSI-edge      eth1

DRM wasn't using MSI in 2.6.27 though.  So I'm still doubtful that the 
MSI issue is really an "*ERROR*".

Thanks
Alan
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