diff --git a/Documentation/sound/designs/midi-2.0.rst b/Documentation/sound/designs/midi-2.0.rst
index d525bc2805f7..d6c17a47c832 100644
--- a/Documentation/sound/designs/midi-2.0.rst
+++ b/Documentation/sound/designs/midi-2.0.rst
@@ -298,6 +298,12 @@ Rawmidi API Extensions
   On the other hand, the UMP rawmidi device number is found in
   `tied_device` field of the legacy rawmidi info, too.
 
+* Each substream of the legacy rawmidi may be enabled / disabled
+  dynamically depending on the UMP FB state.
+  When the selected substream is inactive, it's indicated by the bit
+  0x10 (`SNDRV_RAWMIDI_INFO_STREAM_INACTIVE`) in the `flags` field of
+  the legacy rawmidi info.
+
 
 Control API Extensions
 ======================
diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index 7f1fec786b72..6f2e95298fc7 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -89,6 +89,7 @@ struct snd_rawmidi_substream {
 	unsigned int framing;		/* whether to frame input data */
 	unsigned int clock_type;	/* clock source to use for input framing */
 	int use_count;			/* use counter (for output) */
+	bool inactive;			/* inactive substream (for UMP legacy) */
 	size_t bytes;
 	spinlock_t lock;
 	struct snd_rawmidi *rmidi;
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 1fcff031b5e3..9f3b32602ac1 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -728,6 +728,7 @@ enum {
 #define SNDRV_RAWMIDI_INFO_INPUT		0x00000002
 #define SNDRV_RAWMIDI_INFO_DUPLEX		0x00000004
 #define SNDRV_RAWMIDI_INFO_UMP			0x00000008
+#define SNDRV_RAWMIDI_INFO_STREAM_INACTIVE	0x00000010
 
 #define SNDRV_RAWMIDI_DEVICE_UNKNOWN		-1
 
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 858878fe487a..8a681bff4f7f 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -629,6 +629,8 @@ static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 	info->subdevice = substream->number;
 	info->stream = substream->stream;
 	info->flags = rmidi->info_flags;
+	if (substream->inactive)
+		info->flags |= SNDRV_RAWMIDI_INFO_STREAM_INACTIVE;
 	strcpy(info->id, rmidi->id);
 	strcpy(info->name, rmidi->name);
 	strcpy(info->subname, substream->name);
diff --git a/sound/core/ump.c b/sound/core/ump.c
index 0bfab84eaafb..d6cd11be8750 100644
--- a/sound/core/ump.c
+++ b/sound/core/ump.c
@@ -1250,8 +1250,8 @@ static int fill_legacy_mapping(struct snd_ump_endpoint *ump)
 	return num;
 }
 
-static void fill_substream_names(struct snd_ump_endpoint *ump,
-				 struct snd_rawmidi *rmidi, int dir)
+static void update_legacy_substreams(struct snd_ump_endpoint *ump,
+				     struct snd_rawmidi *rmidi, int dir)
 {
 	struct snd_rawmidi_substream *s;
 	const char *name;
@@ -1265,6 +1265,7 @@ static void fill_substream_names(struct snd_ump_endpoint *ump,
 		scnprintf(s->name, sizeof(s->name), "Group %d (%.16s)%s",
 			  idx + 1, name,
 			  ump->groups[idx].active ? "" : " [Inactive]");
+		s->inactive = !ump->groups[idx].active;
 	}
 }
 
@@ -1272,8 +1273,8 @@ static void update_legacy_names(struct snd_ump_endpoint *ump)
 {
 	struct snd_rawmidi *rmidi = ump->legacy_rmidi;
 
-	fill_substream_names(ump, rmidi, SNDRV_RAWMIDI_STREAM_INPUT);
-	fill_substream_names(ump, rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT);
+	update_legacy_substreams(ump, rmidi, SNDRV_RAWMIDI_STREAM_INPUT);
+	update_legacy_substreams(ump, rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT);
 }
 
 int snd_ump_attach_legacy_rawmidi(struct snd_ump_endpoint *ump,