Am Donnerstag, den 24.09.2009, 10:09 +0200 schrieb Takashi Iwai:
At Sun, 20 Sep 2009 20:50:38 +0200, Matthias Bläsing wrote:
Hello,
it would be nice if I could control the input channels of my lenovo laptop (Lenovo R500). These are configured for microphone input, but the amplifier can be deactivated, so that it can work with the higher line-in level.
The resulting quality is not good, but at least usable.
The volume control is joint, but the amplifier control are seperated. With the HDAAnalyser I could find the Nodes (0x17 (rear) and 0x18 (front)) can be used to control the amplification. The setting can be changed between 0 and 4, where 0 makes it possible to use the input for line-in, while 4 is better suited for microphone input.
I'm not sure whether it would be better to expose this as a stepped control or just a switch (amplifier on/off).
These are the loaded modules (from kernel 2.6.31):
[Module-List]
I attached the /proc/asound/card0/codec#0 info to this email. If you need further information - please ask.
Could you give alsa-info.sh output (run with --no-upload option)? This would be more comprehensive information.
You find the result attached to this email.
Greetings
Matthias