From a314ff44d83e0944df82508e99536c6a4492b5bc Mon Sep 17 00:00:00 2001
From: win2kgamer <47463859+win2kgamer@users.noreply.github.com>
Date: Sat, 20 Sep 2025 00:57:46 -0500
Subject: [PATCH] AD1848: I23 register on CS4231 is read-only, fixes codec
 misdetection on Linux

---
 src/sound/snd_ad1848.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/sound/snd_ad1848.c b/src/sound/snd_ad1848.c
index ff9d36318..ef6f38041 100644
--- a/src/sound/snd_ad1848.c
+++ b/src/sound/snd_ad1848.c
@@ -488,6 +488,8 @@ readonly_x:
                         ad1848_log("AD1848: write(X%d, %02X)\n", ad1848->xindex, val);
                         return;
                     }
+                    if (ad1848->type == AD1848_TYPE_CS4231) /* I23 is reserved and read-only on CS4231 non-A */
+                        goto readonly_i;
                     break;
 
                 case 24: