Comment # 14 on bug 1069846 from Jean Delvare

The device at I2C address 0x73 doesn't have many registers, and no obvious
manufacturer/device ID registers. The author of the init-headphone script
apparently knows exactly what he is doing, so best would be to ask him what
device it is.

I'm not too familiar with the ALSA architecture but if there already is a
driver for this sound device then it may just be a matter of adding some
register saving and restore to the suspend/resume functions of that driver.