Lost audio after new Video card installation

[Carmel]

On Tue, 2 Mar 2010 14:00:31 +0100
Andreas Rudisch <"cyb."@gmx.net> articulated:

> On Tue, 2 Mar 2010 05:51:00 -0500
> Carmel <carmel_ny at hotmail.com> wrote:
> 
> > On Tue, 2 Mar 2010 09:05:03 +0100
> > Andreas Rudisch <"cyb."@gmx.net> articulated:
> > 
> > > On Mon, 1 Mar 2010 19:42:19 -0500
> > > Carmel <carmel_ny at hotmail.com> wrote:
> > > 
> > > > I installed a nVidia GeForce GT 220 card.
> > > > Now, the video is fine; however, there is no audio.
> > > 
> > > > hdac0: <NVidia (Unknown) High Definition Audio Controller> mem
> > > > 0xfcffc000-0xfcffffff irq 16 at device 0.1 on pci3
> > > 
> > > I ran into the same problem after installing a GT 240. The video
> > > cards support audio via HDMI. During boot the audio chip of the
> > > video card is found first (also snd_hda) and used as primary
> > > audio device.
> > > 
> > > After kldunload / kldload snd_hda everything would work properly.
> > > 
> > > As a workaround I do not load the snd_hda kernel module at boot,
> > > but with a cronjob @reboot. This way the normal sound card is
> > > found first.
> 
> > I have sound compiled into my kernel:
> > 
> > # Sound
> > device		sound
> > device		snd_hda		# nVidia MCP51 sound
> > support
> 
> In that case you will not be able to unload/load the kernel module.
> 
> Anyway, I looked again at the problem and the correct way is to simply
> set hw.snd.default_unit to the number of the correct pcm device.
> 
> Since the graphic card uses pcm0 to pcm3, it should be pcm4. Take a
> look at the output of:
> 
> %dmesg | grep hda
> 
> You should see something like:
> 
> pcm2: <HDA NVidia (Unknown) PCM #0 Digital> at cad 2 nid 1 on hdac0
> pcm3: <HDA NVidia (Unknown) PCM #0 Digital> at cad 3 nid 1 on hdac0
> hdac1: HDA Codec #0: Realtek ALC883
> pcm4: <HDA Realtek ALC883 PCM #0 Analog> at cad 0 nid 1 on hdac1
> 
> So set hw.snd.default_unit=4 using sysctl or /etc/sysctl.conf.
> 
> man snd_hda
> man sound
> man sysctl.conf	

Great, I just went and rebuilt the kernel sans sound and now I find the
answer. Anyway, this is what the output for "dmesg | grep -i hda" was
before I rebuilt the kernel:

hdac0: <NVidia MCP51 High Definition Audio Controller> mem 0xfe024000-0xfe027fff irq 21 at device 16.1 on pci0
hdac0: HDA Driver Revision: 20090624_0136
hdac0: [ITHREAD]
hdac0: HDA Codec #1: Realtek ALC883
pcm0: <HDA Realtek ALC883 PCM #0 Analog> at cad 1 nid 1 on hdac0
pcm1: <HDA Realtek ALC883 PCM #1 Analog> at cad 1 nid 1 on hdac0
pcm2: <HDA Realtek ALC883 PCM #2 Digital> at cad 1 nid 1 on hdac0
hdac0: <NVidia MCP51 High Definition Audio Controller> mem 0xfe024000-0xfe027fff irq 21 at device 16.1 on pci0
hdac0: HDA Driver Revision: 20090624_0136
hdac0: [ITHREAD]
hdac0: HDA Codec #1: Realtek ALC883
pcm0: <HDA Realtek ALC883 PCM #0 Analog> at cad 1 nid 1 on hdac0
pcm1: <HDA Realtek ALC883 PCM #1 Analog> at cad 1 nid 1 on hdac0
pcm2: <HDA Realtek ALC883 PCM #2 Digital> at cad 1 nid 1 on hdac0
hdac0: <NVidia MCP51 High Definition Audio Controller> mem 0xfe024000-0xfe027fff irq 21 at device 16.1 on pci0
hdac0: HDA Driver Revision: 20090624_0136
hdac0: [ITHREAD]
hdac0: HDA Codec #1: Realtek ALC883
pcm0: <HDA Realtek ALC883 PCM #0 Analog> at cad 1 nid 1 on hdac0
pcm1: <HDA Realtek ALC883 PCM #1 Analog> at cad 1 nid 1 on hdac0
pcm2: <HDA Realtek ALC883 PCM #2 Digital> at cad 1 nid 1 on hdac0

now, "dmesg | grep -i hda" lists nothing

So if I rebuild the kernel with sound, I should set
hw.snd.default_unit=4, is that correct? Couldn't I use '3' also?

--
Carmel
carmel_ny at hotmail.com

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