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From: Chris Wilson <chris@chris-wilson.co.uk>
Subject: Re: i915_driver_irq_handler: irq 42: nobody cared
To: Jiri Slaby <jslaby@suse.cz>, Jiri Slaby <jirislaby@gmail.com>
Cc: Keith Packard <keithp@keithp.com>, dri-devel@lists.freedesktop.org,
        LKML <linux-kernel@vger.kernel.org>, daniel@ffwll.ch
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References: <4F717CE3.4040206@suse.cz> <4F717D80.9040207@suse.cz> <4F758400.3080907@suse.cz>
Date: Fri, 30 Mar 2012 11:45:43 +0100
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On Fri, 30 Mar 2012 11:59:28 +0200, Jiri Slaby <jslaby@suse.cz> wrote:
> I don't know what to dump more, because iir is obviously zero too. What
> other sources of interrupts are on the (G33) chip?

IIR is the master interrupt, with chained secondary interrupt statuses.
If IIR is 0, the interrupt wasn't raised by the GPU.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre