在我的 Ubuntu 12.04 安装中，所有音乐文件都以单声道播放。
系统声卡（集成）：nVidia MCP61 高清晰度音频（Realtek ALC662）。
有人遇到过同样的问题吗？解决方案是什么？
我不太了解 Linux 驱动程序/内核/模块等。
下面是几个命令及其结果，也许它们可以告诉你一些事情
sudo lspci-v
00:05.0 Audio device: NVIDIA Corporation MCP61 High Definition Audio (rev a2)
Subsystem: Micro-Star International Co., Ltd. Device 7309
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 22
Memory at febf4000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [44] Power Management version 2
Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
Capabilities: [6c] HyperTransport: MSI Mapping Enable- Fixed+
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
lsmod | grep snd
snd_hda_codec_realtek 174313 1
snd_hda_intel 32765 6
snd_hda_codec 109562 2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13276 1 snd_hda_codec
snd_pcm 80845 2 snd_hda_intel,snd_hda_codec
snd_seq_midi 13132 0
snd_rawmidi 25424 1 snd_seq_midi
snd_seq_midi_event 14475 1 snd_seq_midi
snd_seq 51567 2 snd_seq_midi,snd_seq_midi_event
snd_timer 28931 2 snd_pcm,snd_seq
snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 62064 21 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 14635 1 snd
snd_page_alloc 14108 2 snd_hda_intel,snd_pcm
pacmd
Welcome to PulseAudio! Use "help" for usage information.
>>> list-cards
1 card(s) available.
index: 0
name: <alsa_card.pci-0000_00_05.0>
driver: <module-alsa-card.c>
owner module: 4
properties:
alsa.card = "0"
alsa.card_name = "HDA NVidia"
alsa.long_card_name = "HDA NVidia at 0xfebf4000 irq 22"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:05.0"
sysfs.path = "/devices/pci0000:00/0000:00:05.0/sound/card0"
device.bus = "pci"
device.vendor.id = "10de"
device.vendor.name = "NVIDIA Corporation"
device.product.name = "MCP61 High Definition Audio"
device.form_factor = "internal"
device.string = "0"
device.description = "Built-in Audio"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
profiles:
output:analog-stereo: Analog Stereo Output (priority 6000)
output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6060)
output:analog-surround-40: Analog Surround 4.0 Output (priority 700)
output:analog-surround-40+input:analog-stereo: Analog Surround 4.0 Output + Analog Stereo Input (priority 760)
output:analog-surround-41: Analog Surround 4.1 Output (priority 800)
output:analog-surround-41+input:analog-stereo: Analog Surround 4.1 Output + Analog Stereo Input (priority 860)
output:analog-surround-50: Analog Surround 5.0 Output (priority 700)
output:analog-surround-50+input:analog-stereo: Analog Surround 5.0 Output + Analog Stereo Input (priority 760)
output:analog-surround-51: Analog Surround 5.1 Output (priority 800)
output:analog-surround-51+input:analog-stereo: Analog Surround 5.1 Output + Analog Stereo Input (priority 860)
output:analog-surround-71: Analog Surround 7.1 Output (priority 700)
output:analog-surround-71+input:analog-stereo: Analog Surround 7.1 Output + Analog Stereo Input (priority 760)
output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500)
output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5560)
input:analog-stereo: Analog Stereo Input (priority 60)
off: Off (priority 0)
active profile: <output:analog-stereo+input:analog-stereo>
sinks:
alsa_output.pci-0000_00_05.0.analog-stereo/#4: Built-in Audio Analog Stereo
sources:
alsa_input.pci-0000_00_05.0.analog-stereo/#1: Built-in Audio Analog Stereo
alsa_output.pci-0000_00_05.0.analog-stereo.monitor/#5: Monitor of Built-in Audio Analog Stereo
ports:
analog-output: Analog Output (priority 9900, available: unknown)
properties:
analog-output-headphones: Headphones (priority 9000, available: unknown)
properties:
analog-input-microphone-front: Front Microphone (priority 8500, available: no)
properties:
analog-input-microphone-rear: Rear Microphone (priority 8200, available: yes)
properties:
analog-input-linein: Line In (priority 8100, available: no)
properties:
iec958-stereo-output: Digital Output (S/PDIF) (priority 0, available: unknown)
properties: