linux-kernel - Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

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Date:	Fri, 15 Mar 2013 17:21:37 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Greg KH <greg@...ah.com>
Cc:	Harald Arnesen <skogtun.linux@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Peter Hurley <peter@...leysoftware.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Thomas Meyer <thomas@...3r.de>,
	Shawn Starr <shawn.starr@...ers.com>,
	USB list <linux-usb@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Imre Deak <imre.deak@...el.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt
 responses)

On Fri, 15 Mar 2013, Greg KH 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@...ll.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.
> > > 
> > > Wasn't this fixed by the merge from David
> > > (2cc79544bd0aabb4b3cf467ead5df526d9134c64)?
> > 
> > Why do you think it should, please?
> 
> The line:
> 	- Fix PCH irq handling race which resulted in missed gmbus/dp
> 	  aux irqs and subsequent fallout (Paulo)

Ah, that one. I believe that should be irrelevant for GM chipsets, as they 
don't have AUX line, right?

> > (I am seeing this with a2362d247 still).
> 
> Ok, I guess it isn't still fixed properly, just was guessing :)

Seems like this is a different issue.

Thanks,

-- 
Jiri Kosina
SUSE Labs
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