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Date: Wed, 12 Jan 2011 15:06:40 -0800
From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Airlie <airlied@linux.ie>, Chris Wilson <chris@chris-wilson.co.uk>,
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        DRI mailing list <dri-devel@lists.freedesktop.org>
Subject: Re: [git pull] drm intel only fixes
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On Wed, 12 Jan 2011 14:31:33 -0800
Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Wed, Jan 12, 2011 at 2:22 PM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
> >
> > Ah, ok.  So it could be our internal FDI link is underrunning; it goes
> > between the CPU and PCH and carries display bits.
> 
> I'm not sure it's an underrun or anything like that: the corruption is
> long-term in the non-video case. So I take back the "looks like memory
> bandwidth problems", because it really looks more like a corrupted
> blit operation there.

Ah ok if it's long running then yeah it's more likely to be a rendering
issue.  It could also be the FDI link getting its timings messed up
though, and consistently delivering the wrong bits; that could show up
in the same place on the screen each time, or it might move in a
pattern across the screen (usually from top to bottom).

> Will do. I'll have to reboot to the broken kernel (my bisection ended
> in a non-broken case)

Great, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center