linux-kernel - Re: Radeon jittery post 2.6.35

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Message-ID: <BANLkTingdS+OWM3FnzhzPKY72d2h7_+9Jw@mail.gmail.com>
Date:	Mon, 25 Apr 2011 10:53:46 -0400
From:	Jerome Glisse <j.glisse@...il.com>
To:	Anders Eriksson <aeriksson@...tmail.fm>
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 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/

Cheers,
Jerome
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