From 2073876eaf8b15c15a84265f0a8152c710100079 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christopher=20M=C3=BChl?= <toki@toph.so>
Date: Wed, 18 Feb 2026 01:50:47 +0100
Subject: [PATCH] Add Blue Yeti USB reset service for cold-boot fix

The Blue Yeti mic initializes audio endpoints in a broken state on cold boot
because snd-usb-audio loads after device enumeration. This systemd service
toggles USB authorization to force a clean rebind.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 hosts/endurance/default.nix | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/hosts/endurance/default.nix b/hosts/endurance/default.nix
index 2dafd65..f76bd9e 100644
--- a/hosts/endurance/default.nix
+++ b/hosts/endurance/default.nix
@@ -198,6 +198,31 @@
   # systemd.packages = [pkgs.lact];
   # systemd.services.lactd.wantedBy = ["multi-user.target"];
 
+  # Blue Yeti (046d:0ab7) initializes its audio endpoints in a broken state on cold boot
+  # because snd-usb-audio loads ~2s after the device enumerates. Toggling authorized
+  # forces a USB rebind on a clean device, mimicking unplug/replug.
+  systemd.services.blue-yeti-reset = {
+    description = "Reset Blue Yeti USB mic to fix cold-boot initialization";
+    after = ["systemd-udev-settle.service"];
+    wantedBy = ["multi-user.target"];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = pkgs.writeShellScript "blue-yeti-reset" ''
+        for dev in /sys/bus/usb/devices/*/; do
+          [ -f "$dev/idVendor" ] || continue
+          vendor=$(cat "$dev/idVendor" 2>/dev/null)
+          product=$(cat "$dev/idProduct" 2>/dev/null)
+          if [ "$vendor" = "046d" ] && [ "$product" = "0ab7" ]; then
+            echo 0 > "$dev/authorized"
+            sleep 0.5
+            echo 1 > "$dev/authorized"
+            break
+          fi
+        done
+      '';
+    };
+  };
+
   hardware = {
     amdgpu = {
       opencl.enable = true;