我正在使用ubuntu 13.10 64bit。我仅在耳机中得到一侧（一个通道）声音。笔记本电脑的扬声器是相当不错的。笔记本电脑的耳机插孔和耳机都工作正常。这是软件问题。我会定期升级系统，并且在最近的1或2升级后会发生此问题。
也有一种解决方法。将音量设置为低并迅速将其设置为高。完成这几次后，恢复耳机的两个通道。如何永久解决呢？
匿名-r
3.11.0-15-generic
播放-l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC270 Analog [ALC270 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
猫/ proc /声音/版本
Advanced Linux Sound Architecture Driver Version k3.11.0-15-generic.
头-n 1 / proc /声音/卡* /编解码器＃*
==> /proc/asound/card0/codec#0 <==
Codec: Realtek ALC270
==> /proc/asound/card0/codec#3 <==
Codec: Intel PantherPoint HDMI
pulseaudio --check [shows no output. with sudo return permission denied to read home directory]
脉冲音频--dump-conf
### Read from configuration file: /etc/pulse/daemon.conf ###
daemonize = no
fail = yes
high-priority = yes
nice-level = -11
realtime-scheduling = yes
realtime-priority = 5
allow-module-loading = yes
allow-exit = yes
use-pid-file = yes
system-instance = no
local-server-type = user
cpu-limit = no
enable-shm = yes
flat-volumes = no
lock-memory = no
exit-idle-time = 20
scache-idle-time = 20
dl-search-path = /usr/lib/pulse-4.0/modules
default-script-file = /etc/pulse/default.pa
load-default-script-file = yes
log-target = auto
log-level = notice
resample-method = speex-float-1
enable-remixing = yes
enable-lfe-remixing = no
default-sample-format = s16le
default-sample-rate = 44100
alternate-sample-rate = 48000
default-sample-channels = 2
default-channel-map = front-left,front-right
default-fragments = 8
default-fragment-size-msec = 10
enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 1
deferred-volume-extra-delay-usec = 0
shm-size-bytes = 0
log-meta = no
log-time = no
log-backtrace = 0
rlimit-fsize = -1
rlimit-data = -1
rlimit-stack = -1
rlimit-core = -1
rlimit-rss = -1
rlimit-as = -1
rlimit-nproc = -1
rlimit-nofile = 256
rlimit-memlock = -1
rlimit-locks = -1
rlimit-sigpending = -1
rlimit-msgqueue = -1
rlimit-nice = 31
rlimit-rtprio = 9
rlimit-rttime = 1000000
搅拌机-c 0
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined
Playback channels: Mono
Limits: Playback 0 - 87
Mono: Playback 67 [77%] [-15.00dB] [on]
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 87
Mono:
Front Left: Playback 87 [100%] [0.00dB] [on]
Front Right: Playback 87 [100%] [0.00dB] [on]
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 87
Mono:
Front Left: Playback 0 [0%] [-65.25dB] [off]
Front Right: Playback 0 [0%] [-65.25dB] [off]
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 '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 'Mic Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 3 [100%] [36.00dB]
Front Right: 3 [100%] [36.00dB]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 18 [58%] [10.50dB] [on]
Front Right: Capture 18 [58%] [10.50dB] [on]
Simple mixer control 'Auto-Mute Mode',0
Capabilities: enum
Items: 'Disabled' 'Enabled'
Item0: 'Enabled'
Simple mixer control 'Digital',0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 120
Front Left: Capture 60 [50%] [0.00dB]
Front Right: Capture 60 [50%] [0.00dB]
pacmd转储卷
No PulseAudio daemon running, or not running as session daemon.
sudo pactl信息
Server String: unix:/run/user/1000/pulse/native
Library Protocol Version: 28
Server Protocol Version: 28
Is Local: yes
Client Index: 28
Tile Size: 65472
User Name: shantanu
Host Name: shantanu-voillo
Server Name: pulseaudio
Server Version: 4.0
Default Sample Specification: s16le 2ch 44100Hz
Default Channel Map: front-left,front-right
Default Sink: alsa_output.pci-0000_00_1b.0.analog-stereo
Default Source: alsa_input.pci-0000_00_1b.0.analog-stereo
Cookie: 381c:e256
@Braiam我已使用您的必需信息编辑了问题。
—
shantanu 2013年
您是否还在其他设备上检查过耳机？
—
Svetlana Belkin
@belkinsa是的。我还检查了多个耳机。
—
shantanu 2013年
您的解决方法（将音量设置为低并快速将其设置为高。完成这两次操作后，恢复耳机的两个通道。）对我有用。你到底是怎么做到的。为什么要修复它？
—
克里斯·沃尔什
pulseaudio --check，pulseaudio --dump-conf，amixer -c 0，pacmd dump-volumes和pactl info。