Date: Fri, 15 Mar 2013 14:33:13 +0100 (CET)
From: Jiri Kosina <jkosina@suse.cz>
To: Harald Arnesen <skogtun.linux@gmail.com>
Cc: Kernel development list <linux-kernel@vger.kernel.org>,
        "Rafael J. Wysocki" <rjw@sisk.pl>,
        Peter Hurley <peter@hurleysoftware.com>,
        Alan Stern <stern@rowland.harvard.edu>, Thomas Meyer <thomas@m3y3r.de>,
        Shawn Starr <shawn.starr@rogers.com>,
        USB list <linux-usb@vger.kernel.org>, linux-acpi@vger.kernel.org,
        Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org,
        Yinghai Lu <yinghai@kernel.org>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Imre Deak <imre.deak@intel.com>, Daniel Kurtz <djkurtz@chromium.org>,
        dri-devel@lists.freedesktop.org
Subject: Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt
 responses)
In-Reply-To: <5142E7F0.4020002@gmail.com>
Message-ID: <alpine.LNX.2.00.1303151424140.9529@pobox.suse.cz>
References: <Pine.LNX.4.44L0.1303141050310.1983-100000@iolanthe.rowland.org> <1460519.ejNFI1DrGk@vostro.rjw.lan> <1363280764.26318.4.camel@thor.lan> <5657408.cYX6iimiA4@vostro.rjw.lan> <alpine.LNX.2.00.1303150851020.9529@pobox.suse.cz>
 <5142E7F0.4020002@gmail.com>
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On Fri, 15 Mar 2013, Harald Arnesen wrote:

> I have the same problem on my Lenovo T500. I think the graphics card is
> involved.
> 
> This laptop has "hybrid graphics" - one Intel GMA 4500MHD and one ATI
> Mobility Radeon HD 3650. When I boot with the Intel card, I get "irq 16:
> nobody cared" during boot, not when I boot with the ATI card.

Confirming this. After a lot of hassle, I have bisected this reliably to

	commit 28c70f162a315bdcfbe0bf940a740ef8bfb918d6
	Author: Daniel Vetter <daniel.vetter@ffwll.ch>
	Date:   Sat Dec 1 13:53:45 2012 +0100

	    drm/i915: use the gmbus irq for waits

Adding Daniel, Imre and Daniel to CC while I will try to figure out what's 
happening in parallel.

Attaching dmesg.txt from the machine with 28c70f162a as head, with 
drm.debug=0xe.

-- 
Jiri Kosina
SUSE Labs
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