linux-kernel - Re: irq 16: nobody cared

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Date:	Mon, 22 Apr 2013 15:56:29 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	paulmck@...ux.vnet.ibm.com, x86-ml <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: irq 16: nobody cared

On Mon, Apr 22, 2013 at 01:33:12PM +0200, Takashi Iwai wrote:
> At Mon, 22 Apr 2013 12:06:57 +0200,
> Borislav Petkov wrote:
> > 
> > On Mon, Apr 22, 2013 at 11:19:07AM +0200, Takashi Iwai wrote:
> > > Is the PCI device a HD-audio controller for the built-in analog or
> > > a HDMI audio controller coupled with a graphics chip?
> > 
> > Hmm:
> > 
> > [    7.204020] snd_hda_intel 0000:01:00.1: irq 90 for MSI/MSI-X
> > [    7.551912]   #0: HDA ATI SB at 0xfeb00000 irq 16
> 
> So, you have two PCI HD-audio controllers, and 0000:01:00.1 is for
> HDMI while irq 16 is from another onboard audio.  Does the onboard
> audio PCI entry have no MSI support, right?

Looks like it:

$ grep snd /proc/interrupts
  16:        108        109        107        106        106        108        107        118   IO-APIC-fasteoi   snd_hda_intel
  90:          3          3          4          4          4          4          3          3   PCI-MSI-edge      snd_hda_intel

Btw in alsamixer, I have a bunch of controls for the SB soundcard and
when I select the HDMI sound card, it shows only one "S/PDIF" volume
control which can only be muted.

I'd guess this is the audio output over the monitor when it is connected
over HDMI or so.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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