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Date: Tue, 4 Aug 2015 00:05:14 +0200
Message-ID: <CAKMK7uHKfoJ6n+SxGZ4ya+fORh6Nx_CSciyYjE=GaiJdFb=qjQ@mail.gmail.com>
Subject: Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station attached
From: Daniel Vetter <daniel@ffwll.ch>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
        intel-gfx <intel-gfx@lists.freedesktop.org>,
        DRI <dri-devel@lists.freedesktop.org>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Mani Nikula <jani.nikula@linux.intel.com>,
        Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Hans de Goede <hdegoede@redhat.com>, Hart <dvhart@linux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
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On Mon, Aug 3, 2015 at 7:24 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>>                      However, I'm
>> still seeing a large number of drm/i915 related warning messages and
>> other kernel kvetching.
>
> I suspect I can live with that for now. The lockdep one looks like
> it's mainly an initialization issue, so you'd never get the actual
> deadlock in practice, but it's obviously annoying.  The intel_pm.c one
> I'll have to defer to the i915 people for..

The lockdep splat is just acpi being inconsistent with init_mutex vs.
backlight notifier_chain (which has it's own lock) calls. init_mutex
is new in 4.2 and has been added in

commit 87521e16a7abbf3fa337f56cb4d1e18247f15e8a
Author: Hans de Goede <hdegoede@redhat.com>
Date:   Tue Jun 16 16:27:48 2015 +0200

    acpi-video-detect: Rewrite backlight interface selection logic


Not mine ;-) But adding relevant people.

I'll send you a pull for the mst one tomorrow and look into the
watermark fail in intel_pm.c too.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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