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From: Keith Packard <keithp@keithp.com>
To: Andrew Lutomirski <luto@mit.edu>, intel-gfx@lists.freedesktop.org
Subject: Re: 3.0 (or SNA?) regression: failed to train DP, aborting
Date: Sun, 24 Jul 2011 21:54:52 -0700	[thread overview]
Message-ID: <yunpqkzhsdf.fsf@aiko.keithp.com> (raw)
In-Reply-To: <CAObL_7EfE5Seo=5NwbKks3DqzKFZoEQ9hvVLDQirhXGqgZDXsw@mail.gmail.com>


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On Sat, 23 Jul 2011 14:40:36 -0400, Andrew Lutomirski <luto@mit.edu> wrote:
> I have a Q67 (DQ67SW board) attached to a Dell U2711 via DP.  In
> previous kernels, the DP link has worked flawlessly.  I just booted
> 3.0-final and simultaneously enabled SNA, and now when my screen goes
> to sleep I don't get an image back until I power cycle the monitor.
> dmesg says:
> 
> [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
> aborting

Jesse put together a set of 7 display port patches around July 7 which
were merged just after 3.0-rc6. If you try 3.0-rc6 and find that it
works, you should be able to bisect that really quickly; there are only
13 patches post-rc6 in drivers/gpu/drm/i915:

$ git bisect start v3.0 v3.0-rc6 -- drivers/gpu/drm/i915

We tested this on as many machines as we could get our hands on, but
it's a combinatorial problem between the chipset and the monitor...

> I don't know whether this is a 3.0 regression or whether it's
> triggered by SNA, but something broke.

Yeah, as you noticed, this should have no effect. Please let us know
what you find.

-- 
keith.packard@intel.com

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  parent reply	other threads:[~2011-07-25  4:54 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-23 18:40 3.0 (or SNA?) regression: failed to train DP, aborting Andrew Lutomirski
2011-07-24  2:51 ` Andrew Lutomirski
2011-07-25  4:54 ` Keith Packard [this message]
2011-07-25 15:23   ` Andrew Lutomirski
2011-07-25 16:08     ` Keith Packard
2011-07-25 17:15       ` Andrew Lutomirski
2011-07-25 17:41         ` Keith Packard

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