linux-kernel - Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station attached

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Date:	Tue, 4 Aug 2015 00:05:14 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Mani Nikula <jani.nikula@...ux.intel.com>,
	Ander Conselvan de Oliveira 
	<ander.conselvan.de.oliveira@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Hart <dvhart@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [REGRESSION] Re: i915 driver crashes on T540p if docking station attached

On Mon, Aug 3, 2015 at 7:24 PM, Linus Torvalds
<torvalds@...ux-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@...hat.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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