linux-kernel - Re: Radeon jittery post 2.6.35

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Date:	Wed, 27 Apr 2011 14:16:01 +0200
From:	Anders Eriksson <aeriksson@...tmail.fm>
To:	Jerome Glisse <j.glisse@...il.com>
CC:	Alex Deucher <alexdeucher@...il.com>, airlied@...hat.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	xorg-driver-ati@...ts.x.org
Subject: Re: Radeon jittery post 2.6.35

 On 04/25/11 16:53, Jerome Glisse wrote:
> On Sun, Apr 24, 2011 at 5:24 AM, Anders Eriksson <aeriksson@...tmail.fm> wrote:
> >  On 03/18/11 09:55, Anders Eriksson wrote:
> >>  On 03/16/11 21:09, Anders Eriksson wrote:
> >> >  On 03/15/11 22:46, Alex Deucher wrote:
> >> > >  Try booting with radeon.audio=0 on 2.6.38rc, some TVs have problems
> >> > > with the hdmi packets we send by default.  disabling audio will treat
> >> > > the hdmi like dvi.
> >> > >
> >> > > Alex
> >> > You seem to be on to something there. radeon.audio=0 removes
> >> > what appears to be all of the jitter. I say "appear", because during
> >> > my many test runs today, I've come across moments where my brain
> >> > goes "wasn't what I just noticed on the TV something abnormal?" Both
> >> > in fb mode (post KMS), and in X11. It's definetly improved from useless
> >> > for family use, to perfectly ok though.
> >> >
> >> I was too early on this one. Yesterday (.38) , and today (38-rc8),
> >> are both jittery in post-KMS fb mode and in X, even though I use
> >> radeon.audio=0.
> >>
> >> A power cycling of the TV stabilizes it though.
> >>
> >> I'd be more than happy to test out any patches or ideas you might have.
> >>
> >> -A
> >
> > It turns out all the failure patterns I've thought I've seen so far up
> > through .38.x are moot.
> >
> > However, now on .39-rc, the KMS'd console is stable, and starting X
> > makes it bad again.
> >
> > It there anything useful I can pull from any logs on the startup of X?
> > Either from the X
> > server, or the kernel. Last time I looked at the drm log from the kernel
> > It was unreadable
> > to a mere mortal, but I hope you guys can point me to what debug knobs
> > to enable to get a good
> > view of the interesting parts (How does one start a minimal X, btw?
> > "xinit" gives me an
> > undecorated xterm with the jitter. Can one start something more minimal?)
> >
> > Currently running today's git xorg-server and xf86-video-dri.
> >
> > -Anders
> >
> >
>
> Best is to open a bug and attach xorg log & kernel dmesg.
>
> https://bugs.freedesktop.org/
Done:
https://bugs.freedesktop.org/show_bug.cgi?id=36630

I'd be happy to produce more detailed logs if you tell me what knobs to
tweak.

-Anders
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