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* Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt responses)
@ 2013-03-18  7:14 Thomas Meyer
  0 siblings, 0 replies; 41+ messages in thread
From: Thomas Meyer @ 2013-03-18  7:14 UTC (permalink / raw)
  To: Jiri Kosina
  Cc: Harald Arnesen, Kernel development list,  Rafael J. Wysocki,
	Peter Hurley, Alan Stern, Shawn Starr, USB list,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA, Bjorn Helgaas,
	linux-pci-u79uwXL29TY76Z2rM5mHXA, Yinghai Lu, Daniel Vetter,
	Imre Deak, Daniel Kurtz,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW

My laptop is an Acer 1810T. I see this error message each boot.

Kind regards
Thomas

Jiri Kosina <jkosina@suse.cz> schrieb:

>On Fri, 15 Mar 2013, Jiri Kosina 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.
>
>Just a datapoint -- I have put a trivial debugging patch in place, and it 
>reveals that "nobody cared" for irq 16 happens long after last
>
>	I915_WRITE(GMBUS4 + reg_offset, 0);
>
>has been performed in gmbus_wait_hw_status(). On the other hand, if I 
>comment out both GMBUS4 register offset writes in gmbus_wait_hw_status(), 
>then it of course falls back to GPIO bit-banging, but the "nobody cared" 
>for irq 16 is gone. 
>
>So it seems like something gets severely confused by the I915_WRITE to 
>GMBUS4 + reg_offset. So far this seems to have been reported solely on 
>Lenovos as far as I can see (although a completely different types), so it 
>might be some platform-specific quirk?
>
>Honestly, I still don't understand how all the GMBUS stuff relates to IRQ 
>16 at all. 
>
>-- 
>Jiri Kosina
>SUSE Labs

^ permalink raw reply	[flat|nested] 41+ messages in thread
end of thread, other threads:[~2013-03-19  9:03 UTC | newest]

Thread overview: 41+ messages (download: mbox.gz follow: Atom feed
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     [not found] <Pine.LNX.4.44L0.1303082116310.28403-100000@netrider.rowland.org>
     [not found] ` <1362819234.1220.1.camel@localhost.localdomain>
2013-03-09 13:07   ` [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses) Peter Hurley
2013-03-13 21:35     ` Jiri Kosina
2013-03-14 14:51       ` Alan Stern
2013-03-14 14:56         ` Jiri Kosina
2013-03-14 15:18           ` Alan Stern
2013-03-14 15:39             ` Jiri Kosina
2013-03-14 15:47               ` Jiri Kosina
2013-03-14 16:10               ` Alan Stern
2013-03-14 16:13               ` Alan Stern
2013-03-14 16:09           ` Jiri Kosina
2013-03-14 16:42             ` Peter Hurley
2013-03-14 16:46             ` Rafael J. Wysocki
2013-03-14 17:06               ` Peter Hurley
2013-03-14 17:22                 ` Rafael J. Wysocki
2013-03-14 17:26                   ` Peter Hurley
2013-03-15  7:59                   ` Jiri Kosina
2013-03-15  9:20                     ` Harald Arnesen
2013-03-15 13:33                       ` Jiri Kosina
2013-03-15 13:33                         ` Jiri Kosina
2013-03-15 15:14                         ` Jiri Kosina
2013-03-15 19:14                           ` Yinghai Lu
2013-03-18  2:41                             ` Shawn Starr
2013-03-18  9:12                             ` Jiri Kosina
2013-03-18 18:57                               ` Yinghai Lu
2013-03-18 22:05                                 ` Jiri Kosina
2013-03-18 22:50                                   ` Yinghai Lu
     [not found]                               ` <alpine.LNX.2.00.1303181010080.9529-ztGlSCb7Y1iN3ZZ/Hiejyg@public.gmane.org>
2013-03-18 19:19                                 ` Daniel Vetter
2013-03-18 19:57                                   ` Chris Wilson
2013-03-18 22:04                                   ` Jiri Kosina
2013-03-15 15:32                         ` Greg KH
2013-03-15 15:37                           ` Jiri Kosina
2013-03-15 15:47                             ` Greg KH
2013-03-15 16:21                               ` Jiri Kosina
2013-03-18  8:21                               ` Daniel Vetter
2013-03-18 15:56                                 ` [PATCH] drm/i915: stop using GMBUS IRQs on Gen4 chips (was Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)) Jiri Kosina
2013-03-18 17:04                                   ` Chris Wilson
2013-03-19  8:56                                     ` Jiri Kosina
2013-03-19  9:03                                       ` Chris Wilson
2013-03-18 19:21                                   ` Daniel Vetter
2013-03-14 18:48       ` [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses) Yinghai Lu
2013-03-18  7:14 Thomas Meyer

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