By Jochen Voss, last updated 2011-08-31
The Griffin iMic is a simple USB sound card. It is mostly used as an USB audio adapter for Apple computers which lack built-in sound support (for example the PowerBook G4 has no microphone input) but the iMic also works fine with other computers. This page summarises the Linux hardware support for the device. If you have questions or additional hints, feel free to contact me.
Linux support for the Griffin iMic is very good.
|ALSA controls||work as expected|
easy to understand
Table 1. This table summarises the Linux support for the Griffin iMic USB audio adapter.
The iMic is a small, disk-shaped device, approx. 5cm across and
1cm high. It connects to an USB port and provides two
3.5mm mini-jack connectors
to connect a stereo input and a stereo output device each. You can switch
the input to be either
microphone. The output can
either be connected to external speakers or to a headset.
The USB vendor/product ID of the device is
the lsusb output
one can see that the iMic registers with the system as a standard USB
audio device. The supported sampling frequencies range from 6400Hz
to 48kHz for both input and output.
The following data corresponds to ALSA version 1.0.12rc2 together with the Linux kernel version 220.127.116.11. Hints on how to set up and use ALSA can, for example, be found on my ALSA web page.
The device is supported by the
usb-audio ALSA driver. The
entry in /proc/asound/cards is
0 [system ]: USB-Audio - iMic USB audio system Griffin Technology, Inc iMic USB audio system \ at usb-0000:00:10.2-2, full speed
The corresponding device files in /dev/snd show one playback device and one capture device as expected:
crw-rw---- 1 root audio 116, 0 2006-08-06 20:07 controlC0 crw-rw---- 1 root audio 116, 24 2006-08-06 20:07 pcmC0D0c crw-rw---- 1 root audio 116, 16 2006-08-06 20:07 pcmC0D0p crw-rw---- 1 root audio 116, 33 2006-08-06 20:07 timer
Alsamixer shows the following controls for the device.
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