From 25e561418329a301caf462eaac52ebeb513cdcc0 Mon Sep 17 00:00:00 2001
From: Stamate Viorel <stamate.viorel@gmail.com>
Date: Wed, 10 Jun 2026 14:33:33 +0200
Subject: [PATCH] Fix duplicate dmix ipc_key collisions in asound.conf

All twelve loopback dmix devices shared ipc_key 1028. dmix instances with
the same ipc_key collide on one shared-memory segment, so opening a
loopback playback device intermittently fails with EINVAL ('unable to
open slave') depending on open order - the same signature as #957. The
player then crash-loops; on our production unit the LMS player flapped
189 times/day until the keys were made unique. Also pins the 8ch dmixer
slave rate to 48000 so its format can't drift from the loopbacks.

Running in production on a stock 0.4.10 system since 2026-06-08 with
zero loopback open failures since.

Signed-off-by: Stamate Viorel <stamate.viorel@gmail.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 CHANGELOG.md       |  1 +
 config/asound.conf | 23 ++++++++++++-----------
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd1894792..d40283a48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
   * Upgraded volume calculations to preserve relative positions when hitting the min or max setting via source volume bar
   * Update our spotify provider `go-librespot` to `0.7.3`
   * Upgrade from Logitech Media Server 8.5.2 to Lyrion Music Server 9.0.3
+  * Fixed all loopback dmix devices sharing one ipc_key in asound.conf, which made loopback playback devices intermittently fail to open with EINVAL (#957)
 
 # 0.4.11
 * System
diff --git a/config/asound.conf b/config/asound.conf
index 8990f956c..efc291a52 100644
--- a/config/asound.conf
+++ b/config/asound.conf
@@ -71,6 +71,7 @@ pcm.dmixer {
         period_size 1024
         buffer_size 4096
         channels    8
+        rate        48000
     }
     bindings {
         0 0
@@ -249,7 +250,7 @@ pcm.lb0c {
 }
 pcm.lb1 {
     type dmix
-    ipc_key         1028
+    ipc_key         1029
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_1,0"
@@ -266,7 +267,7 @@ pcm.lb1c {
 
 pcm.lb2 {
     type dmix
-    ipc_key         1028
+    ipc_key         1030
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_2,0"
@@ -282,7 +283,7 @@ pcm.lb2c {
 }
 pcm.lb3 {
     type dmix
-    ipc_key         1028
+    ipc_key         1031
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_3,0"
@@ -298,7 +299,7 @@ pcm.lb3c {
 }
 pcm.lb4 {
     type dmix
-    ipc_key         1028
+    ipc_key         1032
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_4,0"
@@ -314,7 +315,7 @@ pcm.lb4c {
 }
 pcm.lb5 {
     type dmix
-    ipc_key         1028
+    ipc_key         1033
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_5,0"
@@ -332,7 +333,7 @@ pcm.lb5c {
 
 pcm.lb6 {
     type dmix
-    ipc_key         1028
+    ipc_key         1034
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback,1"
@@ -348,7 +349,7 @@ pcm.lb6c {
 }
 pcm.lb7 {
     type dmix
-    ipc_key         1028
+    ipc_key         1035
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_1,1"
@@ -365,7 +366,7 @@ pcm.lb7c {
 
 pcm.lb8 {
     type dmix
-    ipc_key         1028
+    ipc_key         1036
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_2,1"
@@ -381,7 +382,7 @@ pcm.lb8c {
 }
 pcm.lb9 {
     type dmix
-    ipc_key         1028
+    ipc_key         1037
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_3,1"
@@ -397,7 +398,7 @@ pcm.lb9c {
 }
 pcm.lb10 {
     type dmix
-    ipc_key         1028
+    ipc_key         1038
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_4,1"
@@ -413,7 +414,7 @@ pcm.lb10c {
 }
 pcm.lb11 {
     type dmix
-    ipc_key         1028
+    ipc_key         1039
     ipc_perm        0666
     slave {
         pcm         "hw:Loopback_5,1"