Microphone not working on iMac 18,3 27 5K (2017)

[Marek-mahav]

Hello,

I am writing to report an issue with the built-in microphone on my iMac18,3 (27-inch, 2017) with an AMD graphics card and a Cirrus Logic CS8409 audio codec.

I was using Ubuntu 24.04.02 with the Wayland desktop environment but was experiencing problems with the audio drivers, specifically with the microphone. Due to a lack of proper driver support for this model, I decided to reinstall macOS Ventura in order to collect relevant system information for your development team.

I have performed a system diagnostics and am sending you the complete output. I am willing to provide any further diagnostic information regarding the entire system, not just the audio, if needed.

Thank you for your hard work and effort.

Best regards,
Marek HavlikLast

login: Fri Aug 1 18:55:33 on ttys000
mahav@iMac-uzivatela-Marek ~ % echo "--- SYSTEM PROFILER AUDIO DATA ---"; system_profiler SPAudioDataType; echo "--- KEXTSTAT AUDIO ---"; kextstat | grep -i audio; echo "--- IOREG CIRRUS LOGIC ---"; ioreg -l | grep -i "cirrus"
--- SYSTEM PROFILER AUDIO DATA ---
Audio:

Devices:

    Built-in Microphone:

      Default Input Device: Yes
      Input Channels: 2
      Manufacturer: Apple Inc.
      Current SampleRate: 44100
      Transport: Built-in
      Input Source: Internal Microphone

    Built-in Output:

      Default Output Device: Yes
      Default System Output Device: Yes
      Manufacturer: Apple Inc.
      Output Channels: 2
      Current SampleRate: 44100
      Transport: Built-in
      Output Source: Internal Speakers

--- KEXTSTAT AUDIO ---
Executing: /usr/bin/kmutil showloaded
No variant specified, falling back to release
165 5 0xffffff7f960a6000 0x1dff0 0x1dff0 com.apple.iokit.IOAudioFamily (440.2) 626EA2F4-ED14-3987-AEEE-C183C95B4731 <164 7 6 3 1>
168 0 0xffffff7f94f7a000 0xffc 0xffc com.apple.driver.AppleAudioClockLibs (240.1) B4907148-964A-36F2-A97E-E31568A697F8 <9 7 6 3 1>
190 0 0xffffff7f95f22000 0x3000 0x3000 com.apple.driver.AudioAUUC (1.70) 1F0EAF2B-E5B4-3FE2-941B-E00EDA061DC8 <165 115 17 16 9 7 6 3 1>
--- IOREG CIRRUS LOGIC ---
mahav@iMac-uzivatela-Marek ~ % echo "--- SYSTEM OVERVIEW ---"
system_profiler SPHardwareDataType
echo "--- DISPLAY/GRAPHICS INFO ---"
system_profiler SPDisplaysDataType
echo "--- USB DEVICES ---"
system_profiler SPUSBDataType
echo "--- NETWORK INFO ---"
system_profiler SPNetworkDataType
echo "--- AUDIO DEVICES ---"
system_profiler SPAudioDataType
echo "--- KERNEL EXTENSIONS (DRIVERS) ---"
kextstat
--- SYSTEM OVERVIEW ---
Hardware:

Hardware Overview:

  Model Name: iMac
  Model Identifier: iMac18,3
  Processor Name: Quad-Core Intel Core i5
  Processor Speed: 3,4 GHz
  Number of Processors: 1
  Total Number of Cores: 4
  L2 Cache (per Core): 256 KB
  L3 Cache: 6 MB
  Memory: 32 GB
  System Firmware Version: 529.140.2.0.0
  OS Loader Version: 577.140.2~30
  SMC Version (system): 2.41f2
  Serial Number (system): C02V10UBJ1GG
  Hardware UUID: A4426EA0-82BD-5CC0-BD25-FED188F37C87
  Provisioning UDID: A4426EA0-82BD-5CC0-BD25-FED188F37C87

--- DISPLAY/GRAPHICS INFO ---
Graphics/Displays:

Radeon Pro 570:

  Chipset Model: Radeon Pro 570
  Type: GPU
  Bus: PCIe
  PCIe Lane Width: x16
  VRAM (Total): 4 GB
  Vendor: AMD (0x1002)
  Device ID: 0x67df
  Revision ID: 0x00c5
  ROM Revision: 113-D000AA-931
  VBIOS Version: 113-D0001A1L-025
  EFI Driver Version: 01.00.931
  Metal Support: Metal 2
  Displays:
    iMac:
      Display Type: Built-In Retina LCD
      Resolution: Retina 5K (5120 x 2880)
      Framebuffer Depth: 30-Bit Color (ARGB2101010)
      Main Display: Yes
      Mirror: Off
      Online: Yes
      Automatically Adjust Brightness: Yes
      Connection Type: Internal

--- USB DEVICES ---
2025-08-01 19:05:21.406 system_profiler[1436:30007] SPUSBDevice: IOCreatePlugInInterfaceForService failed 0xe00002be
USB:

USB 3.0 Bus:

  Host Controller Driver: AppleUSBXHCISPT
  PCI Device ID: 0xa12f 
  PCI Revision ID: 0x0031 
  PCI Vendor ID: 0x8086 

    Bluetooth USB Host Controller:

      Product ID: 0x8296
      Vendor ID: 0x05ac (Apple Inc.)
      Version: 1.09
      Manufacturer: Broadcom Corp.
      Location ID: 0x14500000

    FaceTime HD Camera (Built-in):

      Product ID: 0x8511
      Vendor ID: 0x05ac (Apple Inc.)
      Version: 72.52
      Serial Number: CCG724208LWH34FFF
      Speed: Up to 480 Mb/s
      Manufacturer: Apple Inc.
      Location ID: 0x14400000 / 1
      Current Available (mA): 500
      Current Required (mA): 500
      Extra Operating Current (mA): 0
      Built-In: Yes

    USB GAMING MOUSE :

      Product ID: 0x1330
      Vendor ID: 0x30fa
      Version: 1.00
      Speed: Up to 12 Mb/s
      Location ID: 0x14300000 / 4
      Current Available (mA): 500
      Current Required (mA): 100
      Extra Operating Current (mA): 0

    Wireless Receiver:

      Product ID: 0x8327
      Vendor ID: 0x248a
      Version: 1.00
      Speed: Up to 12 Mb/s
      Manufacturer: Telink
      Location ID: 0x14100000 / 2
      Current Available (mA): 500
      Current Required (mA): 50
      Extra Operating Current (mA): 0

USB 3.1 Bus:

  Host Controller Driver: AppleUSBXHCIAR
  PCI Device ID: 0x15d4 
  PCI Revision ID: 0x0002 
  PCI Vendor ID: 0x8086 
  Bus Number: 0x00 

--- NETWORK INFO ---
Network:

Ethernet:

  Type: Ethernet
  Hardware: Ethernet
  BSD Device Name: en0
  IPv4:
      Configuration Method: DHCP
  IPv6:
      Configuration Method: Automatic
  Ethernet:
      MAC Address: 78:7b:8a:b4:17:5a
      Media Options: 
      Media Subtype: none
  Proxies:
      Exceptions List: *.local, 169.254/16
      FTP Passive Mode: Yes
  Service Order: 0

Thunderbolt Bridge:

  Type: Ethernet
  Hardware: Ethernet
  BSD Device Name: bridge0
  IPv4:
      Configuration Method: DHCP
  IPv6:
      Configuration Method: Automatic
  Proxies:
      Exceptions List: *.local, 169.254/16
      FTP Passive Mode: Yes
  Service Order: 1

Wi-Fi:

  Type: AirPort
  Hardware: AirPort
  BSD Device Name: en1
  IPv4 Addresses: 192.168.1.110
  IPv4:
      Additional Routes:
          Destination Address: 192.168.1.110
          Subnet Mask: 255.255.255.255
          Destination Address: 169.254.0.0
          Subnet Mask: 255.255.0.0
      Addresses: 192.168.1.110
      ARP Resolved Hardware Address: 30:16:9d:6d:54:87
      ARP Resolved IP Address: 192.168.1.1
      Configuration Method: DHCP
      Confirmed Interface Name: en1
      Interface Name: en1
      Network Signature: IPv4.Router=192.168.1.1;IPv4.RouterHardwareAddress=30:16:9d:6d:54:87
      Router: 192.168.1.1
      Subnet Masks: 255.255.255.0
  IPv6:
      Configuration Method: Automatic
  DNS:
      Server Addresses: 192.168.1.1
  DHCP Server Responses:
      Domain Name Servers: 192.168.1.1
      Lease Duration (seconds): 0
      DHCP Message Type: 0x05
      Routers: 192.168.1.1
      Server Identifier: 192.168.1.1
      Subnet Mask: 255.255.255.0
  Ethernet:
      MAC Address: 98:9e:63:3d:0b:54
      Media Options: 
      Media Subtype: Auto Select
  Proxies:
      Exceptions List: *.local, 169.254/16
      FTP Passive Mode: Yes
  Service Order: 2

--- AUDIO DEVICES ---
Audio:

Devices:

    Built-in Microphone:

      Default Input Device: Yes
      Input Channels: 2
      Manufacturer: Apple Inc.
      Current SampleRate: 44100
      Transport: Built-in
      Input Source: Internal Microphone

    Built-in Output:

      Default Output Device: Yes
      Default System Output Device: Yes
      Manufacturer: Apple Inc.
      Output Channels: 2
      Current SampleRate: 44100
      Transport: Built-in
      Output Source: Internal Speakers

--- KERNEL EXTENSIONS (DRIVERS) ---
Executing: /usr/bin/kmutil showloaded
No variant specified, falling back to release
Index Refs Address Size Wired Name (Version) UUID
1 127 0 0 0 com.apple.kpi.bsd (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
2 12 0 0 0 com.apple.kpi.dsep (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
3 165 0 0 0 com.apple.kpi.iokit (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
4 0 0 0 0 com.apple.kpi.kasan (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
5 0 0 0 0 com.apple.kpi.kcov (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
6 170 0 0 0 com.apple.kpi.libkern (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
7 150 0 0 0 com.apple.kpi.mach (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
8 111 0 0 0 com.apple.kpi.private (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
9 101 0 0 0 com.apple.kpi.unsupported (22.6.0) 525F3E82-890C-3426-88D3-E80CF8E681EC <>
10 13 0xffffff80036e6000 0x79fd0 0x79fd0 com.apple.kec.corecrypto (12.0) 764FC967-3B8C-36C9-9BF3-4740683645A5 <9 8 7 6 3 1>
11 0 0xffffff800184e000 0x3000 0x3000 com.apple.kec.AppleEncryptedArchive (1) 3FC19177-7E48-3793-9D1D-1CD1A09EF32B <10 8 7 6>
12 0 0xffffff8001d70000 0x1ffd 0x1ffd com.apple.kec.Compression (1) 591784ED-D6FB-3C9C-A092-08891081AD11 <10 8 7 6>
13 2 0xffffff800346d000 0xdfe0 0xdfe0 com.apple.kec.Libm (1) E83D62EF-41CE-3A9D-B71D-07861FF8FB86 <6>
14 0 0xffffff8003789000 0x7000 0x7000 com.apple.kec.pthread (1) 183E2FDA-EF4D-3EFE-B98C-0BC477186E17 <9 8 7 6 3 1>
15 1 0xffffff800379f000 0x2fff 0x2fff com.apple.driver.watchdog (1) BD08CE2D-77F5-358C-8F0D-A570540A0BE7 <9 8 7 6 3 1>
16 32 0xffffff8002a46000 0x2000 0x2000 com.apple.iokit.IOACPIFamily (1.4) D342E754-A422-3F44-BFFB-DEE93F6723BC <9 8 6 3>
17 44 0xffffff8002eb6000 0x32000 0x32000 com.apple.iokit.IOPCIFamily (2.9) 1B22CD14-C8DA-3EBD-BFB2-4C394DB040A6 <9 8 7 6 3>
18 11 0xffffff8001ae7000 0x1d000 0x1d000 com.apple.driver.AppleSMC (3.1.9) DD55DA6A-679A-3797-947C-0B50B7B5B659 <17 16 15 9 8 7 6 3 1>
19 2 0xffffff8001371000 0x77ff1 0x77ff1 com.apple.driver.AppleACPIPlatform (6.1) 577575CC-93AA-3C71-A8C5-D03FEBED0582 <18 17 16 9 8 7 6 3 1>
20 5 0xffffff8002fe0000 0x1fff 0x1fff com.apple.driver.IOSlaveProcessor (1) AE814FB3-F7DE-39F0-BB01-08669928B892 <8 7 6 3>
21 4 0xffffff8001acd000 0xdffc 0xdffc com.apple.driver.AppleSEPManager (1.0.1) 1F0A4E11-F72E-3157-BF71-7DE956FB1971 <20 17 10 9 8 7 6 3 1>
22 1 0xffffff8001732000 0x4000 0x4000 com.apple.driver.AppleBusPowerController (1.0) 95C644D4-B16C-3595-96B0-68A902F73C39 <18 16 8 7 6 3>
23 8 0xffffff8001c70000 0x3ffc 0x3ffc com.apple.driver.usb.AppleUSBCommon (1.0) 02C83172-34E4-3CD4-9086-24FCEA2E81B3 <7 6 3 1>
24 1 0xffffff8003333000 0xfff 0xfff com.apple.driver.AppleUSBHostMergeProperties (1.2) D850B2B9-619A-3DE5-A545-1AFF90B3D0EF <6 3 1>
25 15 0xffffff800325c000 0x75ff4 0x75ff4 com.apple.iokit.IOUSBHostFamily (1.2) D0E25720-2CF2-31CE-A1B5-BD0CEC23EF95 <24 23 22 18 16 9 8 7 6 3 1>
26 3 0xffffff8003455000 0xefff 0xefff com.apple.driver.KernelRelayHost (1) C03A438B-FD2F-316C-9902-0629EBA09C14 <25 7 6 3>
27 5 0xffffff8001d73000 0x9ff7 0x9ff7 com.apple.iokit.CoreAnalyticsFamily (1) E4FBE84B-1C41-39A0-9371-312F65D85A60 <9 8 7 6 3 1>
28 1 0xffffff80017a8000 0x6fffc 0x6fffc com.apple.driver.AppleCredentialManager (1.0) D9F561C6-5A11-3880-88D8-B81DA1093CD5 <27 26 21 20 10 9 8 7 6 3 1>
29 4 0xffffff8001e51000 0x9ffa 0x9ffa com.apple.kext.CoreTrust (1) 0F68A45A-DF3B-35B1-AF00-278D69C7771E <10 8 6>
30 2 0xffffff80018cc000 0x1eff6 0x1eff6 com.apple.security.AppleImage4 (5.0.0) 2D8B2A0E-AFA7-3A7B-A727-5F1802FD0E06 <29 10 9 8 7 6 3 2 1>
31 9 0xffffff8001a05000 0x34ffa 0x34ffa com.apple.driver.AppleMobileFileIntegrity (1.0.5) D3C82D9F-B569-3CA7-9835-6C8B5FF00A23 <30 29 27 10 9 8 7 6 3 2 1>
32 0 0xffffff8001822000 0x2ff8 0x2ff8 com.apple.driver.AppleCyrus (1) B1F4EA58-E941-3031-BD3A-CE7B43C7FF50 <31 29 21 20 9 8 7 6 3 1>
33 2 0xffffff8001842000 0x6000 0x6000 com.apple.driver.AppleEffaceableStorage (1.0) C3440029-A77E-3694-9EF3-FF91C5473291 <9 7 6 3 1>
34 0 0xffffff8001852000 0x6000 0x6000 com.apple.driver.AppleFDEKeyStore (28.30) F8B72019-7931-31F6-89BC-56164924FF5C <33 10 9 8 7 6 3 1>
35 5 0xffffff8002efe000 0x15000 0x15000 com.apple.iokit.IOSCSIArchitectureModelFamily (482.120.2) 4B9D881E-8C59-33BA-BCE2-18029B6444EA <8 7 6 3 1>
36 14 0xffffff8002feb000 0x18000 0x18000 com.apple.iokit.IOStorageFamily (2.1) 70B6B0B8-8059-3529-A544-D33C65534409 <9 8 7 6 3 1>
37 2 0xffffff8002f26000 0x10fff 0x10fff com.apple.iokit.IOSCSIBlockCommandsDevice (482.120.2) C2D2C000-791E-3078-9541-F6C01340409E <36 35 8 7 6 3 1>
38 2 0xffffff800342f000 0x1b000 0x1b000 com.apple.iokit.IOUSBMassStorageDriver (235.140.2) 25D75F47-2ABC-37FA-ACA1-7F7F4D377BEB <36 35 25 17 8 7 6 3 1>
39 1 0xffffff8001b5b000 0x7ffd 0x7ffd com.apple.driver.AppleUSBTDM (554) 42E56A3A-AE91-3326-9CB2-4D45EE71EF0D <38 37 36 35 31 25 9 8 7 6 3 1>
40 0 0xffffff800194b000 0x8bffd 0x8bffd com.apple.driver.AppleKeyStore (2) 363103A5-68E8-3735-B551-C8AC821FFE11 <39 31 29 28 26 21 20 10 9 8 7 6 3 1>
41 0 0xffffff8001b0e000 0x9000 0x9000 com.apple.driver.AppleSSE (1.0) EF17459A-B016-32EE-BB87-D447D21AD969 <26 21 20 9 8 7 6 3 1>
42 0 0xffffff8001e5d000 0x2ff8 0x2ff8 com.apple.Dont_Steal_Mac_OS_X (7.0.0) 5E7E5641-2CDD-33E7-93DE-A37D162AECC2 <18 10 9 8 6 3 1>
43 2 0xffffff8001a00000 0x3000 0x3000 com.apple.kext.AppleMatch (1.0.0d1) AD200C9A-8E7A-3636-877C-4C5A4CA3EE73 <8 6 3 1>
44 3 0xffffff80034a2000 0x53000 0x53000 com.apple.security.sandbox (300.0) 472240D8-2618-3C22-B942-689AF01F15FB <43 36 31 9 8 7 6 3 2 1>
45 2 0xffffff8003497000 0x9ff1 0x9ff1 com.apple.security.quarantine (4) 96F9A4EA-D20A-3524-B2BA-C6D125417FB2 <44 43 9 8 7 6 3 2 1>
46 0 0xffffff8001e63000 0x5ffff 0x5ffff com.apple.iokit.EndpointSecurity (1) 115F5E6C-3C91-3742-85E1-D25BD2618FBE <45 31 9 8 7 6 3 2 1>
47 8 0xffffff8002ef8000 0x2ff8 0x2ff8 com.apple.iokit.IOReportFamily (47) 491DDA55-D371-3A28-9A77-C28DB013D8AE <8 7 6 3>
48 0 0xffffff8002aba000 0x37000 0x37000 com.apple.iokit.IOBluetoothFamily (9.0.0) 3020D14B-2C90-35B7-AA7F-60E205F48F03 <47 25 16 9 8 7 6 3 1>
49 0 0xffffff8002b36000 0xc000 0xc000 com.apple.driver.DiskImages (493.0.0) 86C39BC2-0D78-3ABD-9F54-22CCADF348DB <36 9 8 7 6 3 1>
50 0 0xffffff8002c1b000 0xfff 0xfff com.apple.iokit.IOKitRegistryCompatibility (1) 4C5D2489-50F1-3E93-9C59-582AA5F01326 <6 3>
51 11 0xffffff8002c55000 0x16ff4 0x16ff4 com.apple.iokit.IONetworkingFamily (3.4) 9464DB11-7BAB-372E-BE42-312E2C708040 <9 8 7 6 3 1>
52 3 0xffffff8002eaf000 0x5000 0x5000 com.apple.driver.mDNSOffloadUserClient (1.0.1b8) BA6FE987-65DB-34CE-AAA0-CEBB09C55B21 <51 8 6 3 1>
53 5 0xffffff8002fa2000 0x2d000 0x2d000 com.apple.iokit.IOSkywalkFamily (1.0) 035A9AD9-6CDE-362F-8DEC-B664BC6431EC <52 51 9 8 7 6 3 1>
54 3 0xffffff800316d000 0x2dff8 0x2dff8 com.apple.iokit.IOTimeSyncFamily (1150.2) EAEF35B3-696B-3D73-84CD-A7AAE1617477 <53 51 8 7 6 3 1>
55 0 0xffffff8001368000 0x7ff4 0x7ff4 com.apple.nke.applicationfirewall (404) 7BF296CC-746B-3312-BF4A-F8A3650828A9 <9 8 7 6 3 1>
56 0 0xffffff8001b85000 0xefff 0xefff com.apple.AppleSystemPolicy (2.0.0) 2542C3A1-52D0-328F-9D88-37B412DEB1E3 <45 44 31 9 8 7 6 3 2 1>
57 0 0xffffff8001cc0000 0xff8 0xff8 com.apple.security.AppleUserConsent (1) 38011687-F238-3D61-A202-0B07C4A01723 <9 8 7 6 2 1>
58 0 0xffffff800142e000 0x2000 0x2000 com.apple.driver.AppleAPIC (1.7) 99F0CD8C-3575-320A-AB46-89D03642C5BA <17 6 3>
59 6 0xffffff8002b81000 0x62000 0x62000 com.apple.iokit.IOHIDFamily (2.0.0) 092C9A0C-BA5B-34E3-930A-720AD44DB3BD <47 9 8 7 6 3 2 1>
60 2 0xffffff8002f8d000 0xffe 0xffe com.apple.iokit.IOSMBusFamily (1.1) 02901024-7468-311C-98A7-896350D03A80 <7 6 3>
61 0 0xffffff80013ff000 0x6000 0x6000 com.apple.driver.AppleACPIEC (6.1) EF61E26B-21D1-3FAB-891A-34F8B90EC5C3 <60 59 47 19 16 9 8 7 6 3 1>
62 0 0xffffff8001ae2000 0x2ffe 0x2ffe com.apple.driver.AppleSMBIOS (2.1) 0610E081-A6CB-3381-89C8-3041A2C2BB90 <9 6 3>
63 0 0xffffff8001aa6000 0x5ff4 0x5ff4 com.apple.driver.AppleRTC (2.0.1) 5B7DB50D-D132-3806-BA66-482836486310 <16 9 7 6 3 1>
64 0 0xffffff80013f8000 0x2ffa 0x2ffa com.apple.driver.AppleACPIButtons (6.1) 649A8E15-7037-3F58-84DA-047BE0841CB0 <59 47 19 16 9 8 7 6 3 1>
65 2 0xffffff8001828000 0x2000 0x2000 com.apple.driver.AppleEFIRuntime (2.1) CBE99540-C4C5-348D-9154-5A5CF8AA646A <27 9 8 7 6 3>
66 0 0xffffff8003469000 0x1000 0x1000 com.apple.private.KextAudit (1.0) 905AC4E7-AB0F-3043-A945-DDB283895D9F <18 9 8 7 6 3>
67 2 0xffffff800182c000 0xa000 0xa000 com.apple.driver.AppleEFINVRAM (2.1) F8DA24BC-B401-36FF-8ED1-2BABE80EA0C5 <65 9 8 7 6 3 1>
68 1 0xffffff8003383000 0x3cff8 0x3cff8 com.apple.driver.usb.AppleUSBXHCI (1.2) DE9A5356-0DB4-3CA4-96A4-F7E66865DD16 <25 23 16 9 8 7 6 3 1>
69 0 0xffffff80033ca000 0x24ff5 0x24ff5 com.apple.driver.usb.AppleUSBXHCIPCI (1.2) 73AF9981-98B1-339F-826D-805EA2D4A409 <68 25 23 17 16 9 8 7 6 3 1>
70 0 0xffffff80031af000 0x63ff5 0x63ff5 com.apple.iokit.IOUSBFamily (900.4.2) 12151191-2E9F-3A37-B67A-129A82EEEF6B <25 23 17 9 7 6 3 1>
71 0 0xffffff8003336000 0x2ff5 0x2ff5 com.apple.driver.usb.AppleUSBHostPacketFilter (1.0) 04A6BA69-CD17-3D20-A9F0-2BB9F3ED7078 <25 23 9 8 7 6 3 1>
72 0 0xffffff8001914000 0x7000 0x7000 com.apple.driver.AppleIntelLpssGspi (3.0.60) 810EF4EB-90D7-3579-82FF-8C533059D92C <17 16 9 7 6 3>
73 2 0xffffff8002a4d000 0x10000 0x10000 com.apple.iokit.IOAHCIFamily (301.100.1) 6414AB5C-34FE-3570-A9B9-83A31A6D08B8 <7 6 3 1>
74 0 0xffffff8001408000 0xf000 0xf000 com.apple.driver.AppleAHCIPort (378) 2ECDB113-B3F5-3D63-A6D1-4C8E3261265B <73 17 7 6 3 1>
75 0 0xffffff8002a62000 0x17000 0x17000 com.apple.iokit.IOAHCIBlockStorage (350.140.3) 42FEFAD2-5324-3190-98B2-370B58015882 <73 36 8 7 6 3 1>
76 1 0xffffff800191d000 0x6ff4 0x6ff4 com.apple.driver.AppleIntelLpssI2C (3.0.60) 63C1D555-693D-3101-94E8-CD0E38299F73 <17 16 9 7 6 3>
77 0 0xffffff8002c1e000 0x2d000 0x2d000 com.apple.iokit.IONVMeFamily (2.1.0) CB8E0C9E-3F23-3EA0-ACF2-554FE0C33433 <47 36 31 17 9 8 7 6 3 1>
78 0 0xffffff8002c84000 0x20ff5 0x20ff5 com.apple.iokit.AppleBCM5701Ethernet (11.0.0) 5B4B09DC-6BE9-3AA7-98A0-7746C20054A4 <54 52 51 17 16 8 7 6 3 1>
79 0 0xffffff8001aaf000 0x19ff8 0x19ff8 com.apple.driver.AppleSDXC (3.4.3) 2C8936A1-D8A7-391E-98D1-8E0A075CE809 <47 36 17 7 6 3 1>
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mahav@iMac-uzivatela-Marek ~ %

[davidjo]

Unfortunately this is a known issue - for some reason iMac internal microphones dont seem to work using the coding developed for MacbookPros (there are other issues aswell that required code changes - swapped nids, swapped polarity jacks that have attempted fixes).
However I dont have an iMac so I cant really do anything about this - the original code was developed by creating a logging Apple HDA kext driver but that was only for High Sierra and has to be run on the actual hardware (remember there is no information provided by Apple and a lot of the chips involved are custom versions for Apple).
However this has to be done on a pre-sealed boot volume OS so Ventura I believe is out as it uses the sealed boot volume - I think it has to be one before Big Sur.

Your best bet is likely to get the Apple Bootcamp disk, get the cs408_{number}.inf file and look for the AB 14/15 and AB 16 quad APO defs - I think these may refer to the iMacs - as it does define some HDA verbs for setting up - at least I did find some information for MacbookPros (which seems to be AB 57) - never looked for iMacs.
(the 14/15/16 seem to come from definitions in the AppleHDA.kext under Resources in the layout and Platforms files for the TAS audio chips - which seem to be what iMacs of that vintage were using).

PS There is no development team its just something I was able get to work nearly 10 years ago now.

[davidjo]

Actually lets just make sure the mike really is not working.

You need to check the Ubuntu settings Audio option for input and make sure its set to Internal Microphone - also make sure thats an option - there is no automatic switching for the mikes.

Now another issue is the sound is very, very low even when working (this has to be fixed by adding pipewire or alsa setup files to amplify the input - but this is the hardware output for mikes - amplification needs to be done by higher levels of the audio system as in OSX.

I only noticed the internal mike was working because I was using Audacity for testing.
In Audacity you can set it to record from the microphone and I tried and didnt see any sound initially but then blew on things and saw that Audacities input audio monitor registered a signal.
So then I recorded some audio - which you cant really hear - but Audacity can apply effects and one of these is amplification which I applied and then could hear the audio.

[Marek-mahav]

Hi David,

Thank you for your detailed reply and for all your great work.

I followed your instructions and I can confirm that the microphone works, but the amplification is very low, just as you predicted. I was able to verify this using your Audacity tip.

In the meantime, I performed an extensive analysis of the driver files from my Boot Camp installation. I discovered and analyzed the cs4208_38.inf file for the Cirrus Logic audio chip. This file contains crucial information like PinConfigOverride and DSPCoeffs.

I am confident that this data could be key to creating a UCM2 profile and properly setting the amplification for the microphones and speakers.

I have now switched back to Ubuntu, and I'd be happy to share these files or any other information you might need.

[Marek-mahav]

Hi,

I've downloaded the Boot Camp installer and extracted information about the audio and microphone configuration for the iMac18,3 (2017). The .inf files — especially cs4208_38.inf — contain Verb sequences, APO filter definitions, endpoint mappings, and pin routing. I gathered this data directly from the Windows environment (Boot Camp), which provides full driver support for the Cirrus Logic audio chip.

🧪 I'm currently using Ubuntu 24.04.02 with the Wayland desktop environment and kernel version 6.14.0-27-generic.

📁 I'm ready to share these files (including InitVerbs, DSPCoeffs, GUID tables, etc.) for further analysis. If needed, I can upload them as .txt documents.

💻 I'm also happy to offer my iMac as a test device during development and debugging of the snd-hda-codec-cs8409 driver.

Thanks again for your work — I'm happy to assist with testing or UCM2 profile creation.

AtihdWT6.txt

cs4208_38.txt

imac 27 5K 2017.txt

[davidjo]

As it looks as though the internal mike is working fixing amplification is not a function of this driver.

You might want to look through the issues (in particular #135) for suggestions how to fix this (there have been many discussions of this in the past).
The addition of amplification does not require updates to the kernel but are user level additions.
There are two possible paths - adding an alsa user driver - this requires creating a .asoundrc file in your home directory (look for .asoundrc in issues to see many older discussions).
I think now your best bet is wireplumber - which is the pipewire system for adding sound effects (including amplication) (when this project was started pipewire didnt exist).
However you have as much knowledge as I do about this - all I have done is google for information and try things and have not really used wireplumber at all.

I have no idea what a UCM2 profile is.

As has been noted the sound using this driver is quite different from the macs - and one of the primary reasons does seem to be extensive DSP processing by Apple.
If you look in the Ventura AppleHDA.kext Resources directory you will see a platform file and layout files - only one of the layout files refers to your machine type.
When I looked at it there were may DSP coefficients - in particular one thing I did notice a label to one called DspMozartCompressor but although there are coeffcients we have no idea what the actual DSP functions are (Im sure this is not the same as the APO filters - although yet again the application of DSP processing is a user level either alsa or wireplumber function).

[davidjo]

So did a bit of googling and it appears UCM2 profiles are an Alsa thing - not clear how that now interacts with pipewire. (For pro audio you apparently used to use JackD for real time audio but now apparently those functions are also in pipewire).
Heres my analysis - Apple wanted to have a 24 bit audio path for its audio for audio professionals. However most (if not all) standard HDA chips (with internal amplifier nodes) use 16 bit audio. So what Apple did was use the very non-standard 8409 chip which has no internal amplifiers and essentially just transforms the bus bytestream to a TDM bytestream which is what the 24 bit DAC/Amp chips like the TAS5764L in iMacs take as input.
When I looked at the raw Audacity data for my MacbookPro internal mike I could see only the low order 16 bits were actually being used. So it appears the internal mikes are still using 16 bit data but are packed into the low order of 24 bits hence sound silent. Therefore a multiplication of 256 is needed (8 bits) to shift the sound up - which is what I ended up trying in Audacity.

Apparently Asahi linux (linux for Arm machines which is what Im using now) has a completely new audio drivers/setup with proper drivers which give a much closer Apple sound (although Apple has given up on the 8409 chip and now uses its own silicon but still uses commerical DAC/amp chips). Unfortunately Asahi linux isnt working for my machine yet but I have thought of looking at its audio implementation for info about how to handle the higher level audio setup.