Date: Sat, 28 Feb 2015 21:10:13 +0000
From: Chris Wilson <chris@chris-wilson.co.uk>
To: Andrey Skvortsov <Andrej.Skvortzov@gmail.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        David Airlie <airlied@linux.ie>, intel-gfx@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Sitsofe Wheeler <sitsofe@gmail.com>
Subject: Re: [Intel-gfx] [Regression] WARNING:
 drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object
Message-ID: <20150228211013.GB13459@nuc-i3427.alporthouse.com>
Mail-Followup-To: Chris Wilson <chris@chris-wilson.co.uk>,
	Andrey Skvortsov <Andrej.Skvortzov@gmail.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	David Airlie <airlied@linux.ie>, intel-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	Sitsofe Wheeler <sitsofe@gmail.com>
References: <20150203191507.GA2374@crion86>
 <20150203202152.GD5784@nuc-i3427.alporthouse.com>
 <20150204182627.GA2272@crion86>
 <20150204184217.GG10991@nuc-i3427.alporthouse.com>
 <20150223201239.GC3871@crion86>
 <20150223212031.GI15204@nuc-i3427.alporthouse.com>
 <20150223234245.GA24485@phenom.ffwll.local>
 <20150228122037.GA12590@nest>
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On Sat, Feb 28, 2015 at 03:20:37PM +0300, Andrey Skvortsov wrote:
> Unfortunately this is not the last bug, that breaks i915/drm working
> on my laptop. Sometimes system successfully loads with couple warnings mentioned in
> previous mail:
> 
> [   26.922953] WARNING: CPU: 1 PID: 767 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x13f/0x288 [i915]()
> [   26.922954] WARN_ON(obj->frontbuffer_bits)

That's inocuous, but for the serious hang, you may want to try
video=SVIDEO-1:d on the kernel commandline to workaround the hang. (Check
/sys/class/drm/card/ for the actual name of the connector for TV). I
think Ville mentioned he was looking/looked at the atomic-vs-load_detect
changes that is at the heart of the issue here. (Admittedly he did say
it was worthy of a drink or two.)
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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