SND_MAESTRO3(4)

📦 version 12.2, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu questing, ubuntu resolute, ubuntu stonking

✨ snd_maestro3(4) ✨

okay bestie, gather round, because today we're talking about snd_maestro3 — that's the ESS Maestro3/Allegro-1 bridge device driver, and it lives in section 4 of the Kernel Interfaces Manual 💖. yes, kernel interfaces. no, it's not scary. i got you.

🌸 NAME 🌸

snd_maestro3 — the ESS Maestro3/Allegro-1 bridge device driver. that's it, that's the name, it's giving "i do one thing and i slay at it" 💅

🎀 SYNOPSIS 🎀

so there's two whole ways to get this driver into your life, and both are valid, pick your fighter ✨

Option A: bake it into the kernel. drop these lines into your kernel configuration file:

device sound
device snd_maestro3

Option B: load it as a module at boot time. then you just put this single line in loader.conf(5):

snd_maestro3_load="YES"

like. that's it. one line. iconic behavior honestly 🫶

🦋 DESCRIPTION 🦋

the snd_maestro3 driver provides support for the ESS Maestro3 and Allegro-1 sound chips, all under the PCM framework 🎵

these chips? mostly found in laptop computers. they are lowkey the whole package:

  • an AC97 mixer
  • a multi-channel sample rate converter that can mix up to four digital audio streams in hardware (in HARDWARE, bestie, the chip is doing the work, not your CPU, we love an efficient queen 👑)
  • recording support
  • external volume control buttons

and now the important bit, so listen up 🙈 the firmware for the sound processor is licensed under the GNU Public License, and because of that, this driver is not included in the default GENERIC kernel. so no, you don't just get it for free. you have to build it or load it yourself. sorry bestie, licensing said no 💀

🌈 HARDWARE 🌈

the snd_maestro3 driver supports the following audio devices:

  • ESS Technology Allegro-1
  • ESS Technology Maestro3

two chips. both cute. both supported. periodt. ⭐

💜 DIAGNOSTICS 💜

okay this part is the drama section, so pay attention 🎀

the hardware volume control buttons can be connected to two different pin sets on the chip — either GPIO or GD — and it all depends on the manufacturer. which one? who knows. not the driver, that's for sure 😭

the driver has no way of determining this configuration, so a hint may be used to override the default guess.

the default setting for hardware volume control assumes that GD pins are wired to control the hardware volume.

but for systems that have the GPIO pins wired to the hardware volume control buttons, you gotta add this line:

hint.pcm.0.hwvol_config="0"

to the file /boot/device.hints — that's how you override the default setting. and if you don't, your volume buttons might just. not vibe. so yeah. write it down 🫶

🔥 SEE ALSO 🔥

go read those too, i'm not kidding, they're the supporting cast and they ate 💅

⭐ HISTORY ⭐

the snd_maestro3 driver first appeared in FreeBSD 4.3. a legend from day one, no cap. 👑

🧚 AUTHORS 🧚

  • Scott Long <scottl@FreeBSD.org>
  • Darrel Anderson <anderson@cs.duke.edu>

thank you for your service, kings 🫡

and that's the whole page bestie!! this one shipped out from Debian with a date of December 15, 2005 — so yes, she's an elder but she's still serving looks 💖 mwah, go make some noise ✨

📦 where this page comes from