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The PCI sound card Asus Xonar DG PCI provides the following connections: 3x 3,5mm Out, 1x 3,5mm In, 1x Spdif Out and has the following specification: signal-to-noise-ratio = 105 dB, distortion = 0,0025 %, sampling rate = 96kHz @ 24Bit.
The card is supported by Linux since ALSA 1.0.24 or Linux kernel 2.6.38. However, the card is not fully supported: front panel, headset and microphone are not supported by Alsa. Furthermore, the volume of the card has to be controlled by PulseAudio.
The Asus Xonar DG PCI uses the CMI8786 chipset and will be recognized by the kernel in the following way:
84:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788 [Oxygen HD Audio] Subsystem: ASUSTeK Computer Inc. Device 8521 Flags: bus master, medium devsel, latency 64, IRQ 11 I/O ports at f000 [size=256] Capabilities: [c0] Power Management version 2
The kernel module snd-oxygen is used to control the card.
The card can also be used with OSS drivers: http://manuals.opensound.com/usersguide/oss_cmi878x.html.