[pulseaudio-tickets] [Bug 91568] [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound from Subwoofer in 2.1 mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91568

--- Comment #19 from Raymond <superquad.vortex2 at gmail.com> ---
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=8e38395360844806041ea69ab9690f5f174bc40c


static const struct snd_pcm_chmap_elem asus_pcm_2_1_chmaps[] = {
+    { .channels = 2,
+      .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
+    { .channels = 4,
+      .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
+           SNDRV_CHMAP_NA, SNDRV_CHMAP_LFE } }, /* LFE only on right */
+    { }

since the subwoofer node 0x16  does not provide jack detect signal, the driver
just create surround speaker phantom jack

for those asus n751jm with alc668 , the subwoofer node 0x1a support jack
detect, so  it is possible to create "external subwoofer" jack for the
detection of sonic master subwoofer

on alc663 node 0x1e seem can report the status of the subwoofer but pincap does
not expose this capability and lack of unsolicited event

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