[已解决]debian lenny，声卡被ALSA认作单声道

kappa8086

原是ubuntu 8.04，改用debian lenny，本来正常的声卡不发声了，尽管看上去驱动没问题，播放器也煞有介事的播放音乐。。。我确认没有mute。

折腾到后来我想试一下其他插口，是不是输出错误了，结果都试过了，没用，反倒在插回去的一瞬间我听到了一点点声音，插到底就没了。。。啥原理？耳机也这样，但和接触不良的情况有差别，那就是听见的声音总是特别小。

后来总算注意到了mixer中的master没有左右声道（PCM有）。于是难道说，左右抵消了？？？

ALSA把我的声卡认成单声道了，内核驱动的问题？


amixer输出如下：


Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 31
Mono: Playback 31 [100%] [0.00dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB]
Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Front',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB] [on]
Front Right: Playback 31 [100%] [0.00dB] [on]
Simple mixer control 'Front Line',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Front Mic',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Front Mic Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 0 [0%]
Front Right: 0 [0%]
Simple mixer control 'Surround',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-46.50dB] [on]
Front Right: Playback 0 [0%] [-46.50dB] [on]
Simple mixer control 'Center',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 31
Mono: Playback 0 [0%] [-46.50dB] [on]
Simple mixer control 'LFE',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 31
Mono: Playback 0 [0%] [-46.50dB] [on]
Simple mixer control 'Line',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [on]
Front Right: Playback 0 [0%] [-34.50dB] [on]
Simple mixer control 'CD',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [on]
Front Right: Playback 0 [0%] [-34.50dB] [on]
Simple mixer control 'Mic',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [on]
Front Right: Playback 0 [0%] [-34.50dB] [on]
Simple mixer control 'Mic Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 0 [0%]
Front Right: 0 [0%]
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 'IEC958 Default PCM',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 0 [0%] [-12.00dB] [on]
Front Right: Capture 0 [0%] [-12.00dB] [on]
Simple mixer control 'Capture',1
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 0 [0%] [-12.00dB] [on]
Front Right: Capture 0 [0%] [-12.00dB] [on]
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Mic' 'Front Mic' 'Line' 'Front Line' 'CD'
Item0: 'Mic'
Simple mixer control 'Input Source',1
Capabilities: cenum
Items: 'Mic' 'Front Mic' 'Line' 'Front Line' 'CD'
Item0: 'Mic'






lshw中音频设备部分：
（我记得型号应该是realtekHD2xx系列的）

*-multimedia
description: Audio device
product: 82801G (ICH7 Family) High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: driver=HDA Intel latency=0 module=snd_hda_intel

[ 本帖最后由 kappa8086 于 2009-3-4 15:07 编辑 ]

kappa8086

另一台机器上的问题不完全一致，后置输出正常发声，前置无声
编译更新ALSA驱动到最新的1.0.19仍然不能解决问题
GOOGLE了将近一天，终于寻到一法

/etc/modprobe.d/alsa-base
最后需要加一个参数
options snd-hda-intel model=6stack-dig

重启，解决！前置后置都能用了，屏蔽后置的功能也正常，难道Ubuntu的驱动方面比Debian好就好在这儿了？呵呵。。。虽然Master依然显示为单声道，但PCM和Front的都有效，那也OK了

[ 本帖最后由 kappa8086 于 2009-3-4 15:10 编辑 ]

kns1024wh

options snd-hda-intel model=6stack-dig
在ubuntu中这个是自动添加的