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MBP 16,1 System configuration files for the T2 audio driver (https://github.com/MCMrARM/mbp2018-bridge-drv/)
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"

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)

[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
<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
}
# 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
#!/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
@paula-coder-646
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paula-coder-646 commented Aug 29, 2021

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 :)

@1papaya
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1papaya commented Dec 16, 2021

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

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