[alsa-devel] Realtek ALC275

Jason A. Donenfeld jason at zx2c4.com
Thu Feb 11 01:07:48 CET 2010

Hello All,

The new Vaio F series has a Realtek ALC 275, which is currently setup
in patch_realtek.c to use the 269 configuration. Unfortunately this
does not correctly enable the internal microphone, and the line-in is
not tied to any mixer control. The attached file will enable the
internal microphone, but will do so at the expense of the line-in.

According to Takashi, "The problem is that the digital-mic of pin 0x12
has the exclusive connection to the selector 0x22, followed to ADC
0x11, while other analog input pins are connected to 0x23/0x24, to ADC
0x08/0x09. Thus, the driver requires the dynamic switching of ADCs,
which isn't fully guaranteed to work. A similar situation is found for
Conexant codecs, and a same style hack would be needed for the realtek

This bug is being tracked here:
http://code.google.com/p/vaio-f11-linux/issues/detail?id=2 and here:
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4909 .

I'm wondering if anyone has any advice on how to implement the
necessary dynamic ADC switching.

Jason Donenfeld
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