System configuration files for the T2 audio driver (https://github.com/MCMrARM/mbp2018-bridge-drv/)

91-pulseaudio-custom.rules

SUBSYSTEM!="sound", GOTO="pulseaudio_end"
ACTION!="change", GOTO="pulseaudio_end"
KERNEL!="card*", GOTO="pulseaudio_end"

SUBSYSTEMS=="pci", ATTRS{vendor}=="0x106b", ATTRS{device}=="0x1803", ENV{PULSE_PROFILE_SET}="apple-t2.conf"

LABEL="pulseaudio_end"

README.md

The files go to:

• /usr/share/alsa/cards/AppleT2.conf
• /usr/share/pulseaudio/alsa-mixer/profile-sets/apple-t2.conf
• /usr/lib/udev/rules.d/91-pulseaudio-custom.rules

apple-t2.conf

[General]
auto-profiles = no

[Mapping builtin-speaker]
description = Built-in Speaker
device-strings = front:%f
paths-output = builtin-speaker-output
channel-map = front-left,front-right,rear-left,rear-right
priority = 100
direction = output

[Mapping builtin-mic]
description = Built-in Mic
device-strings = front:%f
paths-output = builtin-mic-input
channel-map = left,center,right
priority = 100
direction = input

[Mapping codec-output]
description = Headphone
device-strings = front:%f,1
paths-output = codec-output
channel-map = left,right
priority = 100
direction = output

[Mapping codec-input]
description = Headphone Mic
device-strings = front:%f,1
paths-output = codec-input
channel-map = mono
priority = 100
direction = input

[Profile output:builtin-speaker+input:builtin-mic]
description = Built-in Speaker + Built-in Mic
output-mappings = builtin-speaker
input-mappings = builtin-mic
skip-probe = yes

[Profile output:codec-output+input:builtin-mic]
description = Headphones + Built-in Mic
output-mappings = codec-output
input-mappings = builtin-mic

[Profile output:codec-output+input:codec-input]
description = Headphones + External Mic
output-mappings = codec-output
input-mappings = codec-input

[Profile output:builtin-speaker+input:codec-input]
description = Built-in Speaker + External Mic
output-mappings = builtin-speaker
input-mappings = codec-input

AppleT2.conf

<confdir:pcm/front.conf>
<confdir:pcm/surround40.conf>

AppleT2.pcm.default {
	@args [ CARD ]
	@args.CARD {
		type string
	}

	type asym
	playback.pcm {
		type plug
		slave.pcm {
			type hw
			card $CARD
			device 0
		}
	}
	capture.pcm {
		type plug
		slave.pcm {
			type hw
			card $CARD
			device 1
		}
	}
	hint.device_output 0
	hint.device_input 1
}

AppleT2.pcm.front.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type asym
	playback.pcm {
		type hw
		card $CARD
		device 0
	}
	capture.pcm {
		type hw
		card $CARD
		device 1
	}
	hint.device_output 0
	hint.device_input 1
}
AppleT2.pcm.front.1 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type asym
	playback.pcm {
		type hw
		card $CARD
		device 2
	}
	capture.pcm {
		type hw
		card $CARD
		device 3
	}
	hint.device_output 2
	hint.device_input 3
}
AppleT2.pcm.front.2 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type hw
	card $CARD
	device 4
}

Anyone got mic working on MBP 15,2? With this config it appears in pulsemixer but always records silence.

Some recent updates to ALSA seem to have changed where it looks for apple-t2.conf, I resolved that by copying it to the new directory:

sudo cp '/usr/share/pulseaudio/alsa-mixer/profile-sets/apple-t2.conf' '/usr/share/alsa-card-profile/mixer/profile-sets/apple-t2.conf'

Here's a reddit post I found about this change
And here's the errors pulseaudio was giving before I moved apple-t2.conf:

E: [pulseaudio] module-alsa-card.c: Failed to find a working profile.
E: [pulseaudio] module.c: Failed to load module "module-alsa-card" (argument: "device_id="0" name="pci-0000_04_00.3" card_name="alsa_card.pci-0000_04_00.3" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
E: [pulseaudio] socket-server.c: bind(): Address already in use
E: [pulseaudio] module.c: Failed to load module "module-native-protocol-unix" (argument: ""): initialization failed.

I've used your profile and tweaked it to have it working on my 9,1 (Macbook Air 2020)
https://gist.github.com/bigbadmonster17/8b670ae29e0b7be2b73887f3f37a057b

Hope this helps someone out there

Doesn’t allow for headphone usage on the Pro16,2

Some recent updates to ALSA seem to have changed where it looks for apple-t2.conf, I resolved that by copying it to the new directory:

sudo cp '/usr/share/pulseaudio/alsa-mixer/profile-sets/apple-t2.conf' '/usr/share/alsa-card-profile/mixer/profile-sets/apple-t2.conf'

Here's a reddit post I found about this change

Thank you! Nothing was working for me until I did this. Now works swimmingly on Fedora 35 (even with Pipewire!)

@MCMrARM the updated location for
/usr/share/pulseaudio/alsa-mixer/profile-sets/apple-t2.conf
is now
/usr/share/alsa-card-profile/mixer/profile-sets/apple-t2.conf

as @Redecorating mentioned above. Thank you so much everyone for the excellent profiles otherwise.

If your mic crashes your OS, try adding "intel_iommu=on iommu=pt" to the "GRUB_CMDLINE_LINUX=" line in /etc/default/grub (then "sudo update-grub" for ubuntu, or "grub-mkconfig -o /boot/grub/grub.cfg"). Shoutout to @Redecorating for sharing this fix to us in the discord! I didn't see it documented anywhere else, so figured i'd throw it down as a comment here (since this is the first gist the wiki's audio section links to)

@MCMrARM Do you know what license these files would be under?

Are there any updates that might work with Pop!_OS since it now uses pipewire instead of pulseaudio?

Are there any updates that might work with Pop!_OS since it now uses pipewire instead of pulseaudio?

https://wiki.t2linux.org/guides/audio-config/#using-pipewire-instead-of-pulseaudio the change here to 91-pulseaudio-custom.rules should work.