lenovo/legion/16irx8h: fix audio and remove invalid kernel params

- Remove snd_hda_intel.patch parameter (firmware files don't exist)
- Remove bluetooth.enable_iso=1 (not supported in kernel 6.16)
- Add detailed comments explaining TAS2781 CRC workaround
- Clarify that model=legion-y7000 is temporary until kernel quirk lands
- Enable redistributable firmware for audio support

Tested working: Audio, Bluetooth, TAS2781 codec binding

Author: i-am-logger

lenovo/legion/16irx8h/default.nix

@@ -19,20 +19,68 @@
     config.boot.kernelPackages.nvidia_x11
   ];
 
+  # Comprehensive audio fixes for Legion Pro 7 16IRX8H
+  # This model has both Realtek ALC287 and TAS2781 audio components
+  # The TAS2781 I2C codec binds to the HDA subsystem and requires special handling
+  boot.kernelParams = [
+    # Audio configuration
+    "snd_hda_intel.enable_msi=1"
+    # Legion-specific audio model (required until kernel quirk is upstreamed)
+    "snd_hda_intel.model=legion-y7000"
+    # TAS2781 calibration reset to handle CRC errors in factory calibration data
+    # This is a known issue on Legion laptops where the TAS2781 firmware has corrupted
+    # calibration values; resetting allows the codec to initialize with defaults
+    "snd_soc_tas2781.reset_calib=1"
+    # Hardware fixes
+    "tsc=reliable"  # Fix TSC ADJUST firmware bugs common on Legion laptops
+    # ACPI thermal management fixes for Legion BIOS issues
+    "acpi.debug_layer=0x2"
+    "acpi.debug_level=0x2"
+    "processor.ignore_ppc=1"
+  ];
+
+  # Additional audio configuration for Legion Pro 7
+  boot.extraModprobeConfig = ''
+    # Force specific Legion audio model for proper speaker routing
+    options snd-hda-intel model=lenovo-legion-7i
+  '';
+  
+  # Hardware firmware support for Legion audio
+  hardware.enableRedistributableFirmware = lib.mkDefault true;
+
+  # Enable Bluetooth modules
+  boot.kernelModules = [ "bluetooth" "btusb" ];
+
   hardware = {
     nvidia = {
       modesetting.enable = lib.mkDefault true;
       powerManagement.enable = lib.mkDefault true;
-      #
       prime = {
         intelBusId = "PCI:00:02:0";
         nvidiaBusId = "PCI:01:00:0";
       };
     };
+    
+    # Enable Bluetooth with Legion-optimized settings
+    bluetooth = {
+      enable = lib.mkDefault true;
+      powerOnBoot = lib.mkDefault false;  # Save battery
+      settings = {
+        General = {
+          ControllerMode = "dual";
+          FastConnectable = "true";
+          Experimental = "true";  # Enable LE Audio features
+          KernelExperimental = "true";  # Enable ISO socket support
+        };
+      };
+    };
   };
 
-  # Cooling management
+  # Cooling management for Legion laptops
   services.thermald.enable = lib.mkDefault true;
+  
+  # Audio group permissions
+  users.groups.audio = {};
 
   # √(2560² + 1600²) px / 16 in ≃ 189 dpi
   services.xserver.dpi = 189;

lenovo/legion/16irx8h/default.nix.backup

@@ -0,0 +1,84 @@
+{
+  lib,
+  config,
+  ...
+}:
+{
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/gpu/nvidia/prime.nix
+    ../../../common/gpu/nvidia/ada-lovelace
+    ../../../common/pc/laptop
+    ../../../common/pc/ssd
+    ../../../common/hidpi.nix
+  ];
+
+  boot.initrd.kernelModules = [ "nvidia" ];
+  boot.extraModulePackages = [
+    config.boot.kernelPackages.lenovo-legion-module
+    config.boot.kernelPackages.nvidia_x11
+  ];
+
+  # Comprehensive audio fixes for Legion Pro 7 16IRX8H
+  # This model has both Realtek ALC287 and TAS2781 audio components
+  boot.kernelParams = [
+    # Basic audio MSI support
+    "snd_hda_intel.enable_msi=1"
+    # Legion-specific audio model
+    "snd_hda_intel.model=legion-y7000"
+    # TAS2781 audio codec fixes for calibration CRC errors
+    "snd_hda_intel.patch=tas2781-fix,hp-mute-led-micx"
+    "snd_soc_tas2781.reset_calib=1"
+    # Hardware fixes
+    "tsc=reliable"  # Fix TSC ADJUST firmware bugs common on Legion laptops
+    # ACPI thermal management fixes for Legion BIOS issues
+    "acpi.debug_layer=0x2"
+    "acpi.debug_level=0x2"
+    "processor.ignore_ppc=1"
+    # Bluetooth LE Audio/BAP support (Legion has modern Bluetooth)
+    "bluetooth.enable_iso=1"
+  ];
+
+  # Additional audio configuration for Legion Pro 7
+  boot.extraModprobeConfig = ''
+    # Force specific Legion audio model for proper speaker routing
+    options snd-hda-intel model=lenovo-legion-7i
+  '';
+
+  # Enable Bluetooth modules for LE Audio support
+  boot.kernelModules = [ "bluetooth" "btusb" ];
+
+  hardware = {
+    nvidia = {
+      modesetting.enable = lib.mkDefault true;
+      powerManagement.enable = lib.mkDefault true;
+      prime = {
+        intelBusId = "PCI:00:02:0";
+        nvidiaBusId = "PCI:01:00:0";
+      };
+    };
+    
+    # Enable Bluetooth with Legion-optimized settings
+    bluetooth = {
+      enable = lib.mkDefault true;
+      powerOnBoot = lib.mkDefault false;  # Save battery
+      settings = {
+        General = {
+          ControllerMode = "dual";
+          FastConnectable = "true";
+          Experimental = "true";  # Enable LE Audio features
+          KernelExperimental = "true";  # Enable ISO socket support
+        };
+      };
+    };
+  };
+
+  # Cooling management for Legion laptops
+  services.thermald.enable = lib.mkDefault true;
+  
+  # Audio group permissions
+  users.groups.audio = {};
+
+  # √(2560² + 1600²) px / 16 in ≃ 189 dpi
+  services.xserver.dpi = 189;
+}