Re: Lost audio after new Video card installation

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@xxxxxxxxxxx> 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@xxxxxxxxxxx> 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@xxxxxxxxxxx

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