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flammenflitzer linux # aplay -l
**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: NVidia [HDA NVidia], Gerät 0: ALC888 Analog [ALC888 Analog]
  Sub-Geräte: 0/1
  Sub-Gerät #0: subdevice #0
Karte 0: NVidia [HDA NVidia], Gerät 1: ALC888 Digital [ALC888 Digital]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
Karte 2: NVidia_1 [HDA NVidia], Gerät 3: HDMI 0 [HDMI 0]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
Karte 2: NVidia_1 [HDA NVidia], Gerät 7: HDMI 0 [HDMI 0]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
Karte 2: NVidia_1 [HDA NVidia], Gerät 8: HDMI 0 [HDMI 0]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
Karte 2: NVidia_1 [HDA NVidia], Gerät 9: HDMI 0 [HDMI 0]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0

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flammenflitzer linux # lspci -v | grep -i audio
00:0f.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2)
01:00.1 Audio device: nVidia Corporation Device 0e0c (rev a1)

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flammenflitzer / # cat /proc/asound/cards
 0 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xefff0000 irq 20
 1 [U0x46d0x9a4    ]: USB-Audio - USB Device 0x46d:0x9a4
                      USB Device 0x46d:0x9a4 at usb-0000:00:0b.1-9.1, high speed
 2 [NVidia_1       ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xedffc000 irq 16

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snd_page_alloc          7002  2 snd_hda_intel,snd_pcm
flammenflitzer / # lsmod | grep snd
snd_seq_dummy           1566  0 
snd_seq_oss            24366  0 
snd_seq_midi_event      5756  1 snd_seq_oss
snd_seq                44361  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_pcm_oss            31178  0 
snd_mixer_oss          12805  1 snd_pcm_oss
snd_hda_codec_hdmi     22771  4 
snd_usb_audio         103059  2 
snd_hwdep               5638  1 snd_usb_audio
snd_usbmidi_lib        17446  1 snd_usb_audio
snd_rawmidi            18163  1 snd_usbmidi_lib
snd_seq_device          5453  4 snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi
snd_hda_codec_realtek    46079  1 
snd_hda_intel          22299  7 
snd_hda_codec          73751  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
usbcore               136072  8 dvb_usb_cinergyT2,snd_usb_audio,uvcvideo,dvb_usb,snd_usbmidi_lib,usbhid,ohci_hcd,ehci_hcd
snd_pcm                65692  7 snd_pcm_oss,snd_hda_codec_hdmi,snd_usb_audio,snd_hda_intel,snd_hda_codec
snd_timer              18677  3 snd_seq,snd_pcm
snd_page_alloc          7002  2 snd_hda_intel,snd_pcm

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1 Intel Audio snd_hda_intel snd_hda_codec snd_hda_codec_realtek (OnBoard Soundchip)
2 Intel Audio snd_hda_intel snd_hda_codec_hdmi (Nvidia HDMI)
2 snd_usb_audio (WebCam)

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options snd cards_limit=3
option snd_hda_intel index=0
option snd_hda_intel index=1
option snd_usb_audio index=2

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options snd_hda_intel index=0,1
options snd_usb_audio index=2

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Loading the kernel modules for multiple cards

Frank Barknecht offered this dual card configuration example to the alsa-devel mailing-list.

See TwoCardsAsOne for an idea for setting up an .asoundrc to use two cards together. Read chapter below (a code fix).

# START
alias char-major-116 snd ???
alias char-major-14 soundcore ???
options snd snd_major=116 snd_cards_limit=3 # snd_device_mode=0660 snd_device_gid=29 snd_device_uid=0 ich denke, das brauche ich nicht

# HDA NVidia ALC888
alias sound-slot-0 snd-card-0
alias sound-service-0-0 snd-mixer-oss 
alias sound-service-0-1 snd-seq-oss  
alias sound-service-0-3 snd-pcm-oss 
alias sound-service-0-8 snd-seq-oss  
alias sound-service-0-12 snd-pcm-osshree  

# HDA NVidia HDMI
alias sound-slot-1 snd-card-1
alias sound-service-1-0 snd-mixer-oss
#alias sound-service-1-1 snd-seq-oss
alias sound-service-1-3 snd-pcm-oss
#alias sound-service-1-8 snd-seq-oss
alias sound-service-1-12 snd-pcm-oss

# USB-Audio
alias sound-slot-2 snd-card-2
alias sound-service-1-0 snd-mixer-oss
#alias sound-service-1-1 snd-seq-oss
alias sound-service-1-3 snd-pcm-oss
#alias sound-service-1-8 snd-seq-oss
alias sound-service-1-12 snd-pcm-oss

#alias snd-card-0 snd-card-ice1712
alias snd-card-0 snd_hda_intel
options snd-card-hda-intel index=0

#alias snd-card-1 
alias snd-card-1 snd_hda_intel
options snd-card-hda-intel index=1

#alias snd-card-2 
alias snd-card-2 snd_usb_audio 
options snd-card-usb-audio index=2

# END