This is a kernel driver for sound on Macs with Cirrus 8409 HDA chips. Sound output is now reasonably complete and integrated with Linux. Sound input still needs work.
It will play audio through Internal speakers or headphones.
The primary audio should be set to Analogue Stereo Output in the Settings Audio dialog. Alternatively, if you want to use the internal microphone, set it to Analogue Stereo Duplex.
Sound recording from internal mike and headset mike is not yet fully interfaced with Linux user side.
The recorded sound level is very low but this is the sound level as returned in OSX. Amplification will be required eg using something like PulseEffects.
The hardware device sound format is limited to 2/4 channel 44.1 kHz S24_LE S32_LE. As long as use the default device volume control, other formats, frequencies work.
NOTA BENE: The direct hardware device (hw:0,0) and plughw:0,0 device have NO volume control so will be VERY loud!
Currently this works with MAX98706, SSM3515 and TAS5764L amplifiers. It will NOT work with other amplifiers as each amplifier requires specific programming.
Power down/sleep completely unknown and untested. At the moment everything is permanently powered on.
The Apple speaker setup is 4 speakers as a left tweeter, left woofer, right tweeter and right woofer so this is actually a classic HiFi stereo (ie 2 channel) speaker system. (These names are listed in the layout files under AppleHDA.kext/Contents/Resources).
The channel order for Linux has been modified to left tweeter, right tweeter and left woofer, right woofer as this fits in with the Linux way much better.
The driver also has been modified to duplicate a stereo sound source onto the second stereo channel so all speakers are driven (this essentially replicates the snd_hda_multi_out_analog_prepare function).
This will not sound the same as Apple (which is known to be using specific digital filter effects in CoreAudio).
To create a more Apple-like sound requires creating eg an Alsa pseudo device to channel duplicate a stereo sound and apply different digital filters to the tweeter and woofer channels.
NOTE. My primary testing kernel is now Ubuntu LTS 24.04 6.8.
NOTA BENE. As of linux kernel 6.17 the sound kernel source directory has been completely re-organized. The installation script now works for 6.17 kernel versions (and later when they arrive). The old installation script is now called install.cirrus.driver.pre617.sh. The new version of the install.cirrus.driver.sh script will detect your kernel version and exec the old installation script as needed. For older kernel version you can just run the old installation script directly ie install.cirrus.driver.pre617.sh. Note that for kernel version 6.17 new files and directories have been added to the repo rather than attempting to update the pre 6.17 versions (as the kernel source changes also involved name changes and the new files are more consistent with the new kernel names).
The following installation setup provided by leifliddy.
fedora package install
dnf install gcc kernel-devel make patch wget
ubuntu package install
apt install gcc linux-headers-generic make patch wget
arch package install
pacman -S gcc linux-headers make patch wget
void package install
xbps-install -S gcc make linux-headers patch wget
build driver
git clone https://github.com/davidjo/snd_hda_macbookpro.git
cd snd_hda_macbookpro/
#run the following command as root or with sudo
./install.cirrus.driver.sh
reboot
Deleting driver
# Check your kernel version
uname -a
# delete the ko file
sudo rm /lib/modules/{kernel version}/updates/snd-hda-codec-cs8409.ko
sudo depmod -a
dkms is a framework which allows kernel modules to be dynamically built for each kernel on your system. See here for more details: https://github.com/dell/dkms You will need to first install dkms on your system
install driver via dkms
sudo ./install.cirrus.driver.sh -i
remove driver from dkms
sudo ./install.cirrus.driver.sh -r
