C-Media CMI8738

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The CMI8738 is one of the C-Media cards supported by the cmipci ALSA module.

Contents

• 1 Initial Setup
• 2 Controls

• 3 Troubleshooting Hints

  • 3.1 No Sound from Analog Speakers

• 4 See Also

Initial Setup

Before plugging speakers into the card, check the Master volume control is at a reasonable level, but not at maximum (you might damage your speakers, or worse, your ears).

Also check the following controls are unmuted (and set to reasonable levels):

• PCM
• Synth
• CD

Controls

The following is a partial list (it ignores Capture controls):

• Master
• 3D Control - Switch
• PCM
• Synth
• Line

• Line-In Mode

  • Rear Output
  • Line-In

• CD

• Mic
• Mic Boost
• Phone
• IEC958 5V
• IEC958 Copyright
• IEC958 In Monitor
• IEC958 In Phase Inverse
• IEC958 In Select
• IEC958 In Valid
• IEC958 Loop
• IEC958 Mix Analog

• IEC958 Output

  • on - for digital output
  • off - for analog output

• PC Speaker

• Aux

• Exchange DAC

  • on
  • off

• Four Channel Mode

The Master control on this card is purely a volume control (it has no 'mute' switch).

Troubleshooting Hints

No Sound from Analog Speakers

If you hear no sound when using this card with analog speakers/earphones, try switching off the following:

• IEC958 Output
• Exchange DAC

These can be switched off using alsamixer, amixer or other available mixers. (Tested using Debian 4.0r6, alsamixer v1.0.13 and headphones connected to the SPK jack socket.)

See Also

• The cmipci ALSA module page contains a lot of useful information on this card (and other C-Media cards).

Retrieved from "http://alsa.opensrc.org/C-Media_CMI8738"

Category: Sound cards