MBP 16,1 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
• $HOME/.config/pulse/default.pa
• $HOME/.config/pulse/daemon.conf

The PulseAudio configuration in the home-directory is just an example. What I did was to add the following:

default.pa:

load-module module-combine-sink channels=6 channel_map=front-left,front-right,rear-left,rear-right,front-center,lfe

daemon.conf:

default-sample-channels = 6
enable-lfe-remixing = yes

Originally by MCMrARM (https://gist.github.com/MCMrARM/c357291e4e5c18894bea10665dcebffb)

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,front-center,lfe
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>

AppleT2.pcm.default {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type asym
	playback.pcm {
		type plug
		ttable {
			0.0= 1
			1.3= 1
			2.1= 1
			3.4= 1
			4.0= 1
			5.5= 1
		}
		slave {
			pcm {
				type hw
				card $CARD
				device 0
			}
			channels 6
		}
	}
	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 plug
		ttable {
			0.0= 1
			1.3= 1
			2.1= 1
			3.4= 1
			4.0= 1
			5.5= 1
		}
		slave {
			pcm {
				type hw
				card $CARD
				device 0
			}
			channels 6
		}
	}
	capture.pcm {
		type plug
		slave.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
}

daemon.conf

# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for
## more information. Default values are commented out.  Use either ; or # for
## commenting.

daemonize = no
; fail = yes
; allow-module-loading = yes
; allow-exit = yes
; use-pid-file = yes
; system-instance = no
; local-server-type = user
; enable-shm = yes
; enable-memfd = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no

; high-priority = yes
; nice-level = -11

; realtime-scheduling = yes
; realtime-priority = 5

; exit-idle-time = 20
; scache-idle-time = 20

; dl-search-path = (depends on architecture)

; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa

; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0

; resample-method = speex-float-1
; avoid-resampling = false
; enable-remixing = yes
; remixing-use-all-sink-channels = yes
enable-lfe-remixing = yes
; lfe-crossover-freq = 0

flat-volumes = no
; flat-volumes = yes

; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 200000

; default-sample-format = s16le
; default-sample-rate = 44100
; alternate-sample-rate = 48000
; default-sample-channels = 2
; default-channel-map = front-left,front-right
default-sample-channels = 6
; default-fragments = 4
; default-fragment-size-msec = 25

; enable-deferred-volume = yes
; deferred-volume-safety-margin-usec = 8000
; deferred-volume-extra-delay-usec = 0

default.pa

#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

# This startup script is used only if PulseAudio is started per-user
# (i.e. not in system mode)

.fail

### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore

### Automatically augment property information from .desktop files
### stored in /usr/share/application
load-module module-augment-properties

### Should be after module-*-restore but before module-*-detect
load-module module-switch-on-port-available

### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink
#load-module module-alsa-source device=hw:1,0
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif

### Automatically connect sink and source if JACK server is present
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif

### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif

.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif

### Load several protocols
load-module module-dbus-protocol
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix

### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
#load-module module-native-protocol-tcp
#load-module module-zeroconf-publish

### Load the RTP receiver module (also configured via paprefs, see above)
#load-module module-rtp-recv

### Load the RTP sender module (also configured via paprefs, see above)
#load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink'"
#load-module module-rtp-send source=rtp.monitor

### Load additional modules from GSettings. This can be configured with the paprefs tool.
### Please keep in mind that the modules configured by paprefs might conflict with manually
### loaded modules.
.ifexists module-gsettings.so
.nofail
load-module module-gsettings
.fail
.endif


### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore

### Automatically move streams to the default sink if the sink they are
### connected to dies, similar for sources
load-module module-rescue-streams

### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink

### Honour intended role device property
load-module module-intended-roles

### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle

### If autoexit on idle is enabled we want to make sure we only quit
### when no local session needs us anymore.
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif

### Enable positioned event sounds
load-module module-position-event-sounds

### Cork music/video streams when a phone stream is active
load-module module-role-cork

### Modules to allow autoloading of filters (such as echo cancellation)
### on demand. module-filter-heuristics tries to determine what filters
### make sense, and module-filter-apply does the heavy-lifting of
### loading modules and rerouting streams.
load-module module-filter-heuristics
load-module module-filter-apply

### Make some devices default
#set-default-sink output
#set-default-source input
load-module module-combine-sink channels=6 channel_map=front-left,front-right,rear-left,rear-right,front-center,lfe

I added every files but I can’t seems to get the sound working on my MBP16.

EDIT:
I got it working by placing the provided default.pa and daemon.conf into /etc/pulse and adding realtime-scheduling = no to daemon.conf

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.

EDIT: As of 25 Jan 2021, it seems like the directory for this file has moved back to /usr/share/pulseaudio/alsa-mixer/profile-sets/

I added every files but I can’t seems to get the sound working on my MBP16.

EDIT:
I got it working by placing the provided default.pa and daemon.conf into /etc/pulse and adding realtime-scheduling = no to daemon.conf

I tried this too after having no success and there is now sound but it's not very good quality, sound is coming mostly from the front and not all speakers are being utilised.

Can somebody please help me in porting this to Pipewire? As it's default in F34 but does not work properly (Center and Right channels are swapped). Issue: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1417

BTW; channels swap issue is not only related to Pipewire; I also have right and center channels swapped on Pulseaudio. But there it seems fixable by adding these to config:

realtime-scheduling = yes
realtime-priority = 5

And then rebooting (sometimes Pulseaudio also needs to be started/restarted several times and audio settings turned in gnome audio back and forth).

For pipewire on arch I had to make the change described here to make it use the profile. https://wiki.t2linux.org/guides/audio-config/#using-pipewire-instead-of-pulseaudio

one file's location changes with pipewire on arch, but that might be because of how it's packaged /usr/share/alsa-card-profile/mixer/profile-sets/apple-t2.conf

This version has the ttable section modified, which may fix the centre right mixup. https://gist.github.com/jbredall/67d23a7c7aa1ee51edcb3eb60cd6a893

Hi there, just today I was able to install Fedora with KDE on my MacBook 16. I followed your commands and now I have an Apple Audio Device Multichannel device. however:

• Trying the "Subwoofer" in the settings freezes the settings
• Apart from Front Left and Rear Left the other outputs are mangled so e.g Front Right is Front Left, Rear Right is actually Front Right etc.
• The Input doesnt work at all ...
  I am sorry for not directly including logs or stuff but I am new to this stuff so any help apart from an RTFM would be greatly appreciated :)

built-in microphone volume super low? try this

• pacmd list-sources
• find name of source with description "Apple Audio Device Built-in Mic"
  • for me the name is alsa_input.pci-0000_04_00.3.builtin-mic
• pacmd set-source-volume [source-name] $(( 35565 * 3 ))
  • where [source-name] is the source found before
  • 35565 * 3 = 300% volume