snd_hda_lock_devices(9)

📦 version 7.3.1, in nixpkgs unstable

✨ snd_hda_lock_devices — bestie edition ✨

okay so we're looking at snd_hda_lock_devices(9) from the Kernel API Manual, and honestly? it's a tiny little function with one specific job 🎀 let's get into it.

💖 NAME 💖

snd_hda_lock_devices — pseudo device locking. that's it. that's the whole vibe. locking, but make it pseudo 💅

🌸 SYNOPSIS 🌸

int snd_hda_lock_devices (struct hda_bus *bus );

returns an int, takes one struct hda_bus * pointer. immaculate little signature, no notes 🫶

🦋 ARGUMENTS 🦋

  • bus — the BUS. yes, it's literally just described as "the BUS", capital letters and all. that's the whole argument, bestie, it's the bus 😭

🌈 DESCRIPTION 🌈

so what does it actually do? it toggles card->shutdown to allow or disallow device access (as a hack) 🔥

yes, you read that right — as a hack. the manpage said it, not me. it's flipping card->shutdown around so devices either get to touch stuff or they don't. iconic behavior, slightly unhinged, we respect it 💀

👑 SEE ALSO 👑

this is the part where the manpage goes absolutely feral. it lives in the kernel file ./sound/hda/common/codec.c, and it's bringing the entire friend group. like, all of them. every single one. no cap 🍓

like I said. everyone showed up to the party 💜

also worth shouting out the directory it all hangs out in: ./sound/hda/common 🧚

ngl the "as a hack" note is doing so much heavy lifting here — the manpage is fully aware this is not the elegant solution and it's choosing to be honest about it 🙈

and that's the whole page, bestie! short and sweet, one argument, one card->shutdown toggle, and a SEE ALSO section longer than my entire contact list. this one's from ./sound/hda/common, dated October 2026 — mwah, slay, periodt 💅✨🌸

📦 where this page comes from