the deskstop users are suffered from the side effect of copy front since
stereo is copied to all speakers

can alsa only enabled this feature for notebook ?


/* surrounds */
        for (i = 1; i < mout->num_dacs; i++) {
                if (chs >= (i + 1) * 2) /* independent out */
                        snd_hda_codec_setup_stream(codec, nids[i], stream_tag,
                                                   i * 2, format);
                else if (!mout->no_share_stream) /* copy front */
                        snd_hda_codec_setup_stream(codec, nids[i], stream_tag,
                                                   0, format);
        }

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https://bugs.launchpad.net/bugs/1040873

Title:
  [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound at all:
  Subwoofer not working

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