From b3dcede94b0da0bcaadb550c094ef25e1b265d9d Mon Sep 17 00:00:00 2001
From: Pierre Martin <pierre@front-commerce.com>
Date: Fri, 17 Apr 2026 10:36:27 +0200
Subject: [PATCH] fix(framework): prevent sound issue of external mic detected
 for headphones

---
 nixos/framework.nix | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/nixos/framework.nix b/nixos/framework.nix
index 19630d9..d741b28 100644
--- a/nixos/framework.nix
+++ b/nixos/framework.nix
@@ -81,6 +81,27 @@
     #media-session.enable = true;
   };
 
+  # Fix: IDT 92HD95 codec routes capture to external mic jack when headphones
+  # are plugged in, even if the jack has no mic. Force internal mic routing.
+  # See Node 0x14 (Audio Selector) connection index 3 = Node 0x0e (Internal Mic).
+  services.udev.extraRules = ''
+    ACTION=="change", SUBSYSTEM=="sound", KERNEL=="card0", \
+      RUN+="${pkgs.alsa-tools}/bin/hda-verb /dev/snd/hwC0D0 0x14 SET_CONNECT_SEL 3", \
+      RUN+="${pkgs.alsa-tools}/bin/hda-verb /dev/snd/hwC0D0 0x0e SET_POWER_STATE 0"
+  '';
+  systemd.services.fix-internal-mic = {
+    description = "Force internal mic on IDT 92HD95 (Framework Laptop)";
+    after = [ "sound.target" ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = "${pkgs.writeShellScript "fix-internal-mic" ''
+        ${pkgs.alsa-tools}/bin/hda-verb /dev/snd/hwC0D0 0x14 SET_CONNECT_SEL 3
+        ${pkgs.alsa-tools}/bin/hda-verb /dev/snd/hwC0D0 0x0e SET_POWER_STATE 0
+      ''}";
+    };
+  };
+
   # Enable touchpad support (enabled default in most desktopManager).
   services.libinput.enable = true;