linux-kernel - Re: Microphone not working on PCI ID 8086:3b56

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Message-ID: <20100930132937.GA5728@localhost>
Date:	Thu, 30 Sep 2010 21:29:37 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Jaroslav Kysela <perex@...ex.cz>
Subject: Re: Microphone not working on PCI ID 8086:3b56

On Thu, Sep 30, 2010 at 09:11:07PM +0800, Jeff Chua wrote:
> 
> 
> On Tue, Sep 28, 2010 at 9:42 PM, Takashi Iwai <tiwai@...e.de> wrote:
> > Enable all CONFIG_SND_HDA_*.
> 
> Done that. Still no mic.
> 
> 
> On Tue, Sep 28, 2010 at 9:42 PM, Wu Fengguang <fengguang.wu@...el.com> 
> wrote:
> > It's easier to enable all of them. They are small modules.
> 
> Tried just about everything, still no mic. Sounds works in all cases.
> 
> 
> I found that with SND_HDA_CODEC_INTELHDMI selected, SND_DYNAMIC_MINORS 
> will be enabled by default which won't work in my case as I'm not using 
> udev. Here's a patch to take away the default so non-udev will still 
> works.

Intel HDMI audio selects SND_DYNAMIC_MINORS because it runs out of the
static minor numbers. I initially proposed an extended static
allocation scheme here:
http://comments.gmane.org/gmane.linux.alsa.devel/72916 however the
idea was rejected.

> Do I really need udev to get mic to work?

You can disable SND_HDA_CODEC_INTELHDMI for now. You don't need it.

Thanks,
Fengguang

> 
> 
> 
> --- lx/sound/pci/hda/Kconfig.org	2010-09-14 16:34:52.000000000 +0800
> +++ lx/sound/pci/hda/Kconfig	2010-09-14 16:35:09.000000000 +0800
> @@ -145,7 +145,6 @@
> 
>   config SND_HDA_CODEC_INTELHDMI
>   	bool "Build INTEL HDMI HD-audio codec support"
> -	select SND_DYNAMIC_MINORS
>   	default y
>   	help
>   	  Say Y here to include INTEL HDMI HD-audio codec support in
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