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Thread: Downmixing 5.1 audio to headphones

  1. #1
    Join Date
    Apr 2010
    Ubuntu 10.04 Lucid Lynx

    Angry Downmixing 5.1 audio to headphones

    After a long struggle battling to get Ubuntu to work with my sound setup I'm almost there. I've got 5.1 working, but the problem is now when I plug in my headphones I seem to get strange output.

    Playing a 5.1-encoded video works fine without headphones. When I try to listen with headphones I get an odd situation where I get full stereo but it only seems to consist of certain elements of the original audio, namely the background music. All dialogue is missing.

    I've tried several files in both VLC and Totem and the result is the same. I'm guessing it's because the dialogue track is being output to the centre speaker/subwoofer and my headphones are only playing back the front L/R audio channels. The files in question sound great without headphones, and sound fine with or without headphones when I play them in Windows.

    On Windows all this gets automatically downsampled to stereo whenever I plug my headphones into either the front audio jack on my PC or the headphone jack on my speaker system. The sound driver detects the headphones being inserted and reconfigures the sound to be mixed to stereo. I'm sure Linux has an option to do the same somewhere, but I just can't figure out how.


    00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
    	Subsystem: Giga-byte Technology Device a002
    	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    	Latency: 0, Cache Line Size: 4 bytes
    	Interrupt: pin A routed to IRQ 47
    	Region 0: Memory at fbff4000 (64-bit, non-prefetchable) [size=16K]
    	Capabilities: <access denied>
    	Kernel driver in use: snd_hda_intel
    	Kernel modules: snd-hda-intel
    edit: Actually 12.10 and not 10.04 like my user info says, but the site won't let me update it.

    edit2: After plugging headphones in to either my speaker system or my PC's front audio jack, running the Sound Test from the Sound Settings dialog gives me silence in all outputs except Front Left/Right, confirming what I suspected above. I've been through the Ubuntu sound settings, pavucontrol, alsamixer, gnome-alsamixer and still can't find a downmix option.
    Last edited by isbura; November 13th, 2012 at 04:58 AM. Reason: version info

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