[alsa-devel] Exposure of the input devices of Conexant CX20561 amplifier

[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):
> 
> snd_usb_audio          74152  3 
> snd_usb_lib            13904  1 snd_usb_audio
> snd_hda_codec_conexant    17684  1 
> snd_seq_dummy           2748  0 
> snd_seq_oss            24620  0 
> snd_hda_intel          24064  9 
> snd_hda_codec          65724  2 snd_hda_codec_conexant,snd_hda_intel
> snd_seq_midi            6232  0 
> snd_hwdep               6772  3 snd_usb_audio,snd_hda_codec
> snd_rawmidi            19600  2 snd_usb_lib,snd_seq_midi
> snd_seq_midi_event      6580  2 snd_seq_oss,snd_seq_midi
> snd_pcm_oss            33516  0 
> snd_mixer_oss          13416  1 snd_pcm_oss
> snd_seq                44744  7
> snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
> snd_pcm                64872  6
> snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss
> snd_timer              18448  2 snd_seq,snd_pcm
> snd_seq_device          6424  5
> snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
> snd_page_alloc          8556  2 snd_hda_intel,snd_pcm
> snd                    52452  35
> snd_usb_audio,snd_hda_codec_conexant,snd_seq_oss,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_rawmidi,snd_pcm_oss,snd_mixer_oss,snd_seq,snd_pcm,snd_timer,snd_seq_device
> soundcore               6876  1 snd
> 
> 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.


thanks,

Takashi