linux-kernel - Re: Linux 2.6.33-rc4

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Message-ID: <20100114112618.4304f966@jbarnes-piketon>
Date:	Thu, 14 Jan 2010 11:26:18 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	airlied@...ux.ie
Subject: Re: Linux 2.6.33-rc4

On Thu, 14 Jan 2010 21:15:43 +0200
Pekka Enberg <penberg@...helsinki.fi> wrote:

> Jesse Barnes wrote:
> > On Wed, 13 Jan 2010 23:50:52 +0200
> > Pekka Enberg <penberg@...helsinki.fi> wrote:
> > 
> >> Jesse Barnes wrote:
> >>> On Wed, 13 Jan 2010 23:03:00 +0200
> >>> Pekka Enberg <penberg@...helsinki.fi> wrote:
> >>>
> >>>> On Wed, Jan 13, 2010 at 7:44 AM, Linus Torvalds
> >>>> <torvalds@...ux-foundation.org> wrote:
> >>>>> Hmm. Odd release. Something like 40% of the patches are in DRM
> >>>>> (mostly nouveau and radeon, both staging, so it's a bit less
> >>>>> scary than it sounds. But there's a noticeable i915 component
> >>>>> too). That's all pretty unusual, afaik.
> >>>> 2.6.33-rc4 still suffers from an annoying screen flicker with
> >>>> i915 and KMS on my machine. I *think* it started with 2.6.33-rc1
> >>>> but I haven't had the time to dig deeper.
> >>> Does this patch fix it?  If so I'll queue something like this up
> >>> for -rc5.
> >> Yes, it does. Thanks!
> > 
> > Great, thanks for testing.  I'll send Eric a patch to disable this
> > feature more properly.
> 
> OK, I think I am seeing a different kind of flicker now. It doesn't 
> happen anywhere as often as before (which is probably why I missed it 
> last night). The flicker is more like a flash of some other window 
> whereas the flicker before used to "shake" the screen.
> 
> Does this ring a bell?

Sounds separate from the other issue.  Would it be possible to capture
a video of the flicker?  If it's a FIFO underrun, you may be able to
trigger it by running apps in the background that use a lot of memory
bandwidth.

If it's FBC related, it should occur in 15s intervals or so, depending
on whether you have other stuff going on (again would be memory
bandwidth related).

Please file a bug at bugs.freedesktop.org against drm/intel with what
you find.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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