Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

All music files play as mono on my Ubuntu 12.04 installation.

System soundcard (integrated): nVidia MCP61 High Definition Audio (Realtek ALC662).
Did anyone have the same problem? What's the solution?

I don't know much about Linux drivers / kernels / modules etc.

couple of commands and their results below, maybe they can tell you something

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


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
        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" = "10de" = "NVIDIA Corporation" = "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"
        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>
        alsa_output.pci-0000_00_05.0.analog-stereo/#4: Built-in Audio Analog Stereo
        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
        analog-output: Analog Output (priority 9900, available: unknown)

        analog-output-headphones: Headphones (priority 9000, available: unknown)

        analog-input-microphone-front: Front Microphone (priority 8500, available: no)

        analog-input-microphone-rear: Rear Microphone (priority 8200, available: yes)

        analog-input-linein: Line In (priority 8100, available: no)

        iec958-stereo-output: Digital Output (S/PDIF) (priority 0, available: unknown)
share|improve this question

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.