linux-kernel - Re: radeon issues on MacBook Pro 8,2

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Message-ID: <20120120211214.GC8162@ubuntu-macmini>
Date:	Fri, 20 Jan 2012 15:12:14 -0600
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Dave Airlie <airlied@...hat.com>,
	Alex Deucher <alexander.deucher@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: radeon issues on MacBook Pro 8,2

On Fri, Jan 20, 2012 at 02:38:37PM -0500, Alex Deucher wrote:
> On Fri, Jan 20, 2012 at 10:53 AM, Seth Forshee
> <seth.forshee@...onical.com> wrote:
> > On Thu, Jan 19, 2012 at 02:53:17PM -0600, Seth Forshee wrote:
> >> > >  2. Occasional long delays when suspending. When this happens I see
> >> > >    messages like following in dmesg:
> >> > >
> >> > >      [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
> >> > >      [drm:atom_execute_table_locked] *ERROR* atombios stuck executing D44E (len 62, WS 0, PS 0) @ 0xD46A
> >> > >
> >> > >    Sometimes one of suspend or resume hangs completely, but I can't
> >> > >    tell which and am not sure whether or not it's related. I'm also
> >> > >    testing a Mac Mini with the exact same card which does not seem to
> >> > >    suffer from this issue.
> >> > >
> >> > >    I ran a bisections that identified f8d0edd (drm/radeon/kms: improve
> >> > >    DP detect logic) as introducing problems with suspend, and reverting
> >> > >    this patch on top of 3.2.1 does seem to eliminate both issues.
> >> > >
> >> >
> >> > That patch doesn't really affect the modesetting paths directly; it
> >> > looks like a red herring to me.
> >>
> >> Perhaps. I just started a run of 200 s3 cycles with the patch reverted
> >> to see if I can reproduce the issues. I can usually trigger the problem
> >> with 15 or fewer s3 cycles.
> >
> > The machine completed 200 s3 cycles with the patch reverted without long
> > delays, hangs, or any atombios error messages. Without reverting it
> > doesn't get through many at all before experiencing the errors and long
> > delays or hangs.
> >
> > I added a printout of the connector status resulting from the logic that
> > was changed by f8d0edd. With the logic prior to this commit it
> > consistently returns the status as disconnected, which is correct as I
> > have nothing connected. But with the improved logic the status is
> > sometimes reported as connected, and these coincide with the atombios
> > errors.
> >
> 
> Do any of the disconnected displayport connectors get misdetected as
> connected during normal operation or does it only happen during
> suspend/resume?

So far I've only seen them during suspend/resume.
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