snd_hda_jac...ct_state_mst(9)

💖 snd_hda_jac...ct_state_mst(9) — like, the Kernel API Manual page, bestie 💖

okay so real talk: this is a page from the Kernel API Manual, and the star of the show is snd_hda_jack_detect_state_mst. yes the title got truncated with ... in the header, no that's not a typo, that's just how the man page renders it. iconic behaviour honestly 🎀

---

✨ NAME ✨

snd_hda_jack_detect_state_mst — query pin Presence Detect status 🫶

like... it asks the pin "hey girl are you there" and reports back. that's the whole vibe.

---

🌸 SYNOPSIS 🌸

int snd_hda_jack_detect_state_mst (struct hda_codec *codec , hda_nid_t
nid , int dev_id );

---

🦋 ARGUMENTS 🦋

• codec — the CODEC to sense 👀 like, the thing you're checking on
• nid — the pin NID to sense 📍 the actual pin you're asking about
• dev_id — pin device entry id 🔖 the device entry's little ID number

---

💅 DESCRIPTION 💅

So what it does: it queries the pin's Presence Detect status and returns it. that's it, that's the function. 💖

and the answer comes back as exactly one of these three, no cap:

• HDA_JACK_NOT_PRESENT
• HDA_JACK_PRESENT
• HDA_JACK_PHANTOM

three states, three vibes. HDA_JACK_PHANTOM is giving main character energy ngl 👻✨

---

🌈 SEE ALSO 🌈

the whole friend group 🫶 — plus the kernel file ./sound/hda/common/jack.c where is_jack_detectable(9) lives:

• is_jack_detectable(9) — in ./sound/hda/common/jack.c
• snd_hda_jack_tbl_get_mst(9)
• snd_hda_jack_tbl_get_from_tag(9)
• snd_hda_jack_tbl_new(9)
• snd_hda_jack_set_dirty_all(9)
• snd_hda_jack_pin_sense(9)
• snd_hda_jack_detect_enable_callback_mst(9)
• snd_hda_jack_detect_enable(9)
• snd_hda_jack_set_gating_jack(9)
• snd_hda_jack_bind_keymap(9)
• snd_hda_jack_set_button_state(9)
• snd_hda_jack_report_sync(9)
• snd_hda_jack_add_kctl_mst(9)
• snd_hda_jack_add_kctls(9)
• snd_hda_jack_unsol_event(9)
• snd_hda_jack_poll_all(9)

---

ok that's the whole page bestie, go detect some jacks, slay 💅✨

sooo this came out of ./sound/hda/common and it's dated October 2026 — and the header/footer both say snd_hda_jac...ct_state_mst(9) because the name is long and we respect it 💜 mwah, bye! 🎀🦋