http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/tree/codecs/vt1802-asus-u30s?id=HEAD


compare with this notebook,  device 0 nid is using speaker 's audio output and device 2 is using headphone 's audio output

seem spec->gen.indep_hp = 1 is not enough to force the driver to use speaker audio output by device 0


=> lo_type=2, wired=1, mio=1, badness=0x0
multi_outs = 25/0/0/0 : 8/0/0/0 (type HP)
  out path: depth=4 :08:35:15:25
spk_outs = 24/0/0/0 : 9/0/0/0
  spk path: depth=4 :09:34:14:24
  mix path: depth=4 :08:21:15:25
  mix path: depth=4 :08:21:14:24
==> Best config: lo_type=2, wired=1, mio=1
multi_outs = 25/0/0/0 : 8/0/0/0 (type HP)
  out path: depth=4 :08:35:15:25
spk_outs = 24/0/0/0 : 9/0/0/0
  spk path: depth=4 :09:34:14:24
  mix path: depth=4 :08:21:15:25
  mix path: depth=4 :08:21:14:24

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/hda/hda_generic.c

you need to change 

static bool indep_hp_possible(struct hda_codec *codec)
{
	struct hda_gen_spec *spec = codec->spec;
	struct auto_pin_cfg *cfg = &spec->autocfg;
	struct nid_path *path;
	int i, idx;

+ 	if (cfg->line_out_type == AUTO_PIN_HP_OUT)
+               return false;

	if (cfg->line_out_type == AUTO_PIN_HP_OUT)
		idx = spec->out_paths[0];



http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/tree/codecs/vt1802-asus-g75?id=HEAD

but it is strange that there are two volume controls in same node when it has headphone, speaker and subwoofer


Node 0x08 [Audio Output] wcaps 0x41d: Stereo Amp-Out
  Control: name="Front Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Headphone Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Device: name="VT1802 Analog", type="Audio", device=0
  Amp-Out caps: ofs=0x2a, nsteps=0x2a, stepsize=0x05, mute=0
  Amp-Out vals:  [0x22 0x22]
  Converter: stream=8, channel=0
  PCM:
    rates [0x5e0]: 44100 48000 88200 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
Node 0x09 [Audio Output] wcaps 0x41d: Stereo Amp-Out
  Control: name="Surround Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x2a, nsteps=0x2a, stepsize=0x05, mute=0
  Amp-Out vals:  [0x1d 0x1d]
  Converter: stream=8, channel=2
  PCM:
    rates [0x5e0]: 44100 48000 88200 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0



in your case , it is strange that balanced is set in eapd

EAPD 0x3: BALANCED EAPD


BTL controls the output configuration of a Pin Widget which has indicated support for balanced I/O (bit 6, Pin Capabilities Parameter).  When this bit is 0, the output drivers are configured in normal, single-ended mode; when this bit is 1, they are configured in balanced mode.  Note that in balanced mode, the Pin Widget has twice as many pins as it does in normal mode; i.e., a stereo Pin Widget in balanced mode has four signal pins (in addition to Vref pins).  However, in both modes it must appear to software as a single Pin Widget.  The additional pins must be reserved to this purpose; thus, in a configuration supporting BTL outputs the additional pins may not be enumerated as a separate Pin Widget. 


Node 0x24 [Pin Complex] wcaps 0x40050d: Stereo Amp-Out
  Control: name="Speaker Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Speaker Phantom Jack", index=0, device=0
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00010050: OUT EAPD Balanced
  EAPD 0x3: BALANCED EAPD
  Pin Default 0x901701f0: [Fixed] Speaker at Int N/A
    Conn = Analog, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x14* 0x3e