snd_hda_set_vmaster_tlv(9)

📦 version 7.3.1, in nixpkgs unstable

✨ snd_hda_set_vmaster_tlv(9) ✨

okay so this is a page out of the Kernel API Manual and it's literally about snd_hda_set_vmaster_tlv — the lil function that gives your virtual master control its volume personality. bestie, it's giving "quietly essential" and i'm obsessed 🎀

💖 NAME 💖

snd_hda_set_vmaster_tlv — Set TLV for a virtual master control

🌸 SYNOPSIS 🌸

void snd_hda_set_vmaster_tlv (struct hda_codec *codec , hda_nid_t nid ,
int dir , unsigned int *tlv );

that's the whole signature, no cap. four args, one void return, zero drama ✨

🦋 ARGUMENTS 🦋

  • codec — the HD-audio codec. yes. that codec. your main character 💅
  • nid — the NID of a reference widget. it's the template we're copying the AMP caps from, iykyk 🫶
  • dir — either #HDA_INPUT or #HDA_OUTPUT. pick a direction, bestie, those are the only two 💀
  • tlv — the TLV data to be stored, and it needs at least 4 elements. four minimum. don't come at it with three 🙈

🔥 DESCRIPTION 🔥

So what it actually does: it sets up (static) TLV data for a virtual master volume, using the AMP caps it obtains from the reference NID. literally stealing the blueprint from the widget you pointed at, respectfully 💖

Then the volume range gets recalculated as if the max volume is 0dB — that's the flex, that's the whole point, and ngl it ate 🔥

🌈 SEE ALSO 🌈

Kernel file ./sound/hda/common/codec.c — and honestly the whole friend group showed up, so here's the full roster, no one left behind 🫶:

and that's the whole page, bestie 💜 this gem lives under ./sound/hda/common and the version tag is October 2026 — so like, keep that in mind, that's the timestamp on this whole vibe check. slay, go set some TLVs, and remember: at least 4 elements 💅✨

📦 where this page comes from