CMI8738

3D zvukova karta, vyskytuje se jak jako on-board i jako PCI karta.

On-board PCI 3D zvukova karta. Používá se v mainboardech SystemBoard. (P II a Celeron vč. Socket 370).

Cmedia CMI8738SX pripadne CMI8738-MC6 je levna PCI zvukova karta s fullduplex-em. Slusny pomer kvalita/cena.

• PCI levna zvukova karta
• Fullduplex
• Ovladace DOS pro kompatibilitu se standardem SB Pro + mixer
• YAMAHA opl3 synteza
• vstupy/vystupy: (micro) (line-in) (rear) (speaker/line-out) [MIDI/game]

/proc/pci:

  Bus  0, device  16, function  0:
    Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 16).
      IRQ 9.
      Master Capable.  Latency=64.  Min Gnt=2.Max Lat=24.
      I/O at 0xe800 [0xe8ff].

dmesg (OSS):

cmpci: version $Revision: 5.64 $ time 21:35:09 Dec 27 2001
PCI: Found IRQ 9 for device 00:10.0
cmpci: found CM8738 adapter at io 0xe800 irq 9
cmpci: chip version = 037

dmesg (ALSA):

PCI: Found IRQ 9 for device 00:10.0
snd: C-Media PCI CM8738 (model 37) at 0xe800, irq 9 is detected

/proc/asound/cards:

0 [card1          ]: C-Media PCI - C-Media PCI CM8738
                     C-Media PCI CM8738 (model 37) at 0xe800, irq 9

/proc/asound/pcm:

00-00: C-Media PCI CM8738 : C-Media PCI DAC/ADC : playback 1 : capture 1
00-01: C-Media PCI CM8738 : C-Media PCI 2nd DAC : playback 1
00-02: C-Media PCI CM8738 : C-Media PCI SPDIF : playback 1 : capture 1

/proc/asound/sndstat:

Sound Driver:3.8.2-980706 (ALSA v0.5.12 emulation code)
Kernel: Linux flash 2.4.14-dj2 #6 Sat Nov 17 22:04:36 CET 2001 i586
Config options: 0

Installed drivers: 
Type 10: ALSA emulation

Card config: 
C-Media PCI CM8738 (model 37) at 0xe800, irq 9
Mixers:
0: C-Media PCI

Karta je podporovana od jadra 2.2.13.
Pro starsi jadra je nutno pouzit ovladac z www.cmedia.com.tw

Pokud je ovladac zkompilovan jako modul, tak se jmenuje cmipci (OSS) nebo snd_cmipci (ALSA)
Postup zprovozneni je popsan v /usr/src/linux/Documentation/sound/CMI8338

1. V pripade, ze pouzijeme ALSu, prelozime ji napr. nasledovne:

   # ./configure --with-sequencer=yes --with-oss=yes --with-cards=cmipci

2. Spustime pod rootem alsaconf, vybereme cmipci a upravime modules.conf aby se automaticky natahoval potrebny modul.
3. Pak jiz staci nastavit mixerem pozadovane hodnoty a provest prikaz:

   # alsactl store

   Od ted se nam po natazeni modulu automaticky nastavi mixer.

Na vsech novych jadrech funguje bez problemu.

Model LX (na obrázku) poskytuje šestikanálový zvuk (front out, rear out, center, bass out). Analog AC-3 to 6-ch output. Stereo linearity input, microphone input, CD input, AUX input. General 128 bit MIDI audio. Odstup signálu od šumu >85 dB.