From 352db47931060a944329f7c1830337cdcbb47109 Mon Sep 17 00:00:00 2001
From: Jordan Holt <jordan@vimium.com>
Date: Sat, 4 May 2024 13:08:09 +0100
Subject: [PATCH] Only reload snd_usb_audio if 1824c not initialised

---
 modules/hardware/presonus-studio.nix | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/hardware/presonus-studio.nix b/modules/hardware/presonus-studio.nix
index 8f151c0..c643b14 100644
--- a/modules/hardware/presonus-studio.nix
+++ b/modules/hardware/presonus-studio.nix
@@ -36,8 +36,11 @@ in {
         kmod
       ];
       script = ''
-        rmmod snd_usb_audio
-        insmod /run/booted-system/kernel-modules/lib/modules/$(uname -r)/extra/snd-usb-audio.ko.xz
+        # Only reload if device hasn't been initialised
+        if ! cat /proc/asound/card*/usbmixer | grep -q "Mute Main Out Switch"; then
+          rmmod snd_usb_audio
+          insmod /run/booted-system/kernel-modules/lib/modules/$(uname -r)/extra/snd-usb-audio.ko.xz
+        fi
       '';
     };