AC'97 (short for Audio Codec '97; also MC'97, short for Modem Codec '97) is Intel Corporation's Audio "Codec" standard developed by the Intel Architecture Labs in 1997, and used mainly in motherboards, modems, and sound cards.

C-Media AC97 audio

• CMI9738(C-media CMI9738 UDA 039)
• CMI9739(C-media CMI9739 UDA 039)
• CMI9761(C-media CMI9761 UDA 044)
• CMI9780

Troubleshooting for C-Media AC97 device problem

Sometimes the sound do does not work on computer and in the devices panel you may get the yellow cirlce with an exclamation point on the C-Media AC97 Audio device.

Solution: You need to re-install the driver for the sound device. Download the latest driver for your C-Media AC97 device

• C-Media AC97 Audio Device