linux-kernel - Re: 2.6.24-rc2 breaks nVidia MCP51 High Definition Audio

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Date:	Thu, 08 Nov 2007 16:41:58 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Gerhard Mack <gmack@...erfire.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...e.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.24-rc2 breaks nVidia MCP51 High Definition Audio

At Thu, 8 Nov 2007 08:38:18 -0500 (EST),
Gerhard Mack wrote:
> 
> On Thu, 8 Nov 2007, Takashi Iwai wrote:
> 
> > At Wed, 7 Nov 2007 19:07:07 -0500 (EST),
> > Gerhard Mack wrote:
> > > 
> > > On Wed, 7 Nov 2007, Andrew Morton wrote:
> > > 
> > > > Date: Wed, 7 Nov 2007 15:21:27 -0800
> > > > From: Andrew Morton <akpm@...ux-foundation.org>
> > > > To: Gerhard Mack <gmack@...erfire.net>
> > > > Cc: linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...e.cz>,
> > > >     Takashi Iwai <tiwai@...e.de>, Rafael J. Wysocki <rjw@...k.pl>
> > > > Subject: Re: 2.6.24-rc2 breaks nVidia MCP51 High Definition Audio
> > > > 
> > > > > On Wed, 7 Nov 2007 17:39:41 -0500 (EST) Gerhard Mack <gmack@...erfire.net> wrote:
> > > > > hello,
> > > > > 
> > > > > This worked fine in 2.6.23 but now the kernel no longer sees my audio 
> > > > > controller.
> > > > > 
> > > > > 00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev 
> > > > > a2)
> > > > > 00:10.1 0403: 10de:026c (rev a2)
> > > > > 
> > > > > Let me know if I can provide more info or test patches.
> > > > > 
> > > > 
> > > > Please provide the output of `dmesg -s 1000000' for both 2.6.23
> > > > and 2.6.24-rc3, thanks.
> > > > 
> > > > Are you sure that the driver is suitably configured?  Sometimes
> > > > we like to fiddle config options so that a `make oldconfig' will go and
> > > > unconfigure drivers which you need.
> > > 
> > > Found an option for generic HD audio and enabled that with only marginally 
> > > better results.  Now instead of not detecting my card it's showing a 
> > > single volume control in the mixer and not providing any sound at all.
> > > 
> > > 2.6.23:
> > > Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 
> > > 09:12:58 2007 UTC).
> > > ACPI: PCI Interrupt Link [AAZA] enabled at IRQ 22
> > > ACPI: PCI Interrupt 0000:00:10.1[B] -> Link [AAZA] -> GSI 22 (level, low) 
> > > -> IRQ 22
> > > PCI: Setting latency timer of device 0000:00:10.1 to 64
> > > ALSA device list:
> > >   #0: HDA NVidia at 0xfe024000 irq 22
> > > GACT probability on
> > > 
> > > 2.6.24-rc2:
> > > Advanced Linux Sound Architecture Driver Version 1.0.15 (Tue Oct 23 
> > > 06:09:18 2007 UTC).
> > > ACPI: PCI Interrupt Link [AAZA] enabled at IRQ 22
> > > ACPI: PCI Interrupt 0000:00:10.1[B] -> Link [AAZA] -> GSI 22 (level, low) 
> > > -> IRQ 22
> > > PCI: Setting latency timer of device 0000:00:10.1 to 64
> > > ieee1394: Host added: ID:BUS[0-00:1023]  GUID[0011d8000101f761]
> > > ALSA device list:
> > >   #0: HDA NVidia at 0xfe024000 irq 22
> > > GACT probability on
> > 
> > Both look OK.
> > 
> > Please show your kernel config and /proc/asound/card0/codec#*
> > contents.  Did you choose CONFIG_SND_HDA_CODEC_* properly?
> > 
> > Also, please be more specific about your hardware.  The implementation
> > of HD-audio stuff is deifferent greatly among products.  It's very
> > important to know what kind of machine (h/w vendor, product name,
> > model, etc) to identify whether the configuration is known or not
> > (i.e. it was really supported or it worked just casually).
> 
> The machine is an Asus M2NPV-VM motherboard with an Nforce MCP51 chpset. 
> and there is not an CONFIG_SND_HDA_CODEC_ option for NVIDIA so I selected 
> generic instead.

That's the problem.   MCP51 is the controller chip, not a codec chip.
It's always supported by snd-hda-intel driver.  CONFIG_SND_HDA_CODEC_*
are configs to choose codec chips.

Simply select all CONFIG_SND_HDA_CODEC_*=y if you are not sure (as
they are default=y).  I guess CONFIG_SND_HDA_CODEC_ANALOG=y should
suffice but selecting others won't hurt except for a small memory
footprint.


Takashi
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