Hi,
I have an LG LE50 Express laptop which required some very strange (to me)
mixer settings before I could get the microphone to record anything.
It seems the mic capture volume is governed by the "Digital" mixer item. To
record anything, I needed to turn up the "Digital" level from its initial
setting of 0.
The "Capture" mixer seems to control capturing from the mixer (?) rather
than the mic, i.e. it captures what is heard in the speakers.
However to be able to record anything through the mic, the "Capture" mixer
must have capture enabled (the L-R CAPTUR indication in alsamixer), but
the "Capture" level itself does not matter for the mic recording.
So, to sum up these are the problems:
* The "Digital" mixer really controls the mic level.
* Mic recording is controlled by turning on capture for the "Capture" mixer.
All of this is thorougly confusing.
My kernel version is 2.6.24 (i386).
~$ lspci | grep Audio
00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio
Controller (rev 01)
~$ ~$ dmesg|grep hda-intel
hda-intel: Invalid position buffer, using LPIB read method instead.
~$ cat /proc/asound/cards
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xc0000000 irq 18
~$ cat /proc/asound/devices
0: [ 0] : control
1: : sequencer
16: [ 0- 0]: digital audio playback
17: [ 0- 1]: digital audio playback
22: [ 0- 6]: digital audio playback
24: [ 0- 0]: digital audio capture
25: [ 0- 1]: digital audio capture
30: [ 0- 6]: digital audio capture
33: : timer
~$ aumix -q
vol 84, 84
igain 0, 0
dig1 100, 100, P
~$ amixer scontents
Simple mixer control 'Master',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 26 [84%] [-7.50dB] [on]
Front Right: Playback 26 [84%] [-7.50dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 191 [75%] [-12.80dB]
Front Right: Playback 191 [75%] [-12.80dB]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Mono: Playback [on] Capture [off]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 15
Front Left: Capture 0 [0%] [0.00dB] [on]
Front Right: Capture 0 [0%] [0.00dB] [on]
Simple mixer control 'Capture Mux',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 4
Front Left: 4 [100%] [40.00dB]
Front Right: 4 [100%] [40.00dB]
Simple mixer control 'Caller ID',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Digital',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 120
Front Left: Capture 65 [54%] [2.50dB]
Front Right: Capture 65 [54%] [2.50dB]
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Front Mic' 'Line' 'CD'
Item0: 'Front Mic'
Simple mixer control 'Off-hook',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Cheers,
Marcus
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