snd_hdac_re...e_amp_stereo(9)

📦 version 7.3.1, in nixpkgs unstable

💖 snd_hdac_regmap_update_amp_stereo — the stereo AMP glow-up 💖

okay so bestie, welcome to the Kernel API Manual ✨ this one lives in section 9, and it's literally called snd_hdac_regmap_update_amp_stereo. yes the title gets truncated to snd_hdac_re...e_amp_stereo(9) on the header line because man pages are dramatic like that 🙈 but the real, full, government name is the one up there. let's get into it 🫶

🌸 NAME 🌸

snd_hdac_regmap_update_amp_stereo — update the stereo AMP value 💅

like, that's the whole job. she updates. she's stereo. she's an AMP value. iconic behavior honestly 👑

✨ SYNOPSIS ✨

int snd_hdac_regmap_update_amp_stereo (struct hdac_device *codec ,
hda_nid_t nid , int dir , int idx , int mask , int val );

that's six whole arguments bestie, she is NOT low maintenance 😭 but every single one of them is doing something, so let's go through them one by one, no cap 🧚

🎀 ARGUMENTS 🎀

  • codec — the HD-audio codec 💖 like, the whole device vibe, the main character of this function call
  • nid — the NID to read the AMP value 🔍 (yes, to read it — that's what the man page says, don't come for me)
  • dir — either #HDA_INPUT or #HDA_OUTPUT 🦋 pick your direction, bestie, you can't have both
  • idx — the index value 👑 and listen, this one's only for the input direction, so if you're outputting, she's not invited to the party
  • mask — bit mask to set 🎯 the bits you're allowed to touch
  • val — the bits value to set ✨ the bits you're actually setting them to

🔥 DESCRIPTION 🔥

so the way this works is: update the stereo AMP value with a bit mask 🎚️ that's it, that's the plot.

and here's the little detail you cannot forget, iykyk:

the lower byte is left, the upper byte is right 💅

lower = left, upper = right. write it on your hand. put it in your notes app. tattoo it. because if you mix those up it's giving chaos and nobody wants that 🙈

🌈 RETURN 🌈

  • 0 — the value is unchanged, nothing happened, she's unbothered, she's chilling 💤
  • 1 — the value changed, something moved, we love growth ⭐
  • negative — an error 😭 and yeah, negative means it went wrong, that's the whole mood

🦋 SEE ALSO 🦋

the kernel file lives at ./include/sound/hda_regmap.h 📁 and honestly? the whole friend group is in there:

go read them, they're all slay in their own way 🫶✨

okay and for the cute little sign-off moment: this whole page is living under ./include/sound in the kernel tree, stamped October 2026 🌸 and she goes by snd_hdac_re...e_amp_stereo(9) when she's being shy about her full name. mwah, go update some stereo AMP values bestie 💋👑🎀

📦 where this page comes from