http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commitdiff;h=c21ca4a872697aeda4fe91bf9b6cc8380c62827c;hp=03c6901ea22bbb532586334d5b79941ccf56d5b0

the above commit require line out type must be AUTO_PIN_LINE_OUT to
create "line jack mode" to retask blue as line out for multi channels
playback

this means that you need a pin fixup for 0x0d from speaker to line out
at ext rear

/* check whether the line-input can be used as line-out */
static hda_nid_t check_line_out_switch(struct hda_codec *codec)
{
        struct sigmatel_spec *spec = codec->spec;
        struct auto_pin_cfg *cfg = &spec->autocfg;
        hda_nid_t nid;
        unsigned int pincap;

        if (cfg->line_out_type != AUTO_PIN_LINE_OUT)
                return 0;

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https://bugs.launchpad.net/bugs/1074427

Title:
  [SG41, IDT 92HD89C2, Green Headphone Out, Front] No sound at all

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