diff --git a/spa/plugins/alsa/alsa-pcm-device.c b/spa/plugins/alsa/alsa-pcm-device.c
index 60c8faf88..b32e4f59a 100644
--- a/spa/plugins/alsa/alsa-pcm-device.c
+++ b/spa/plugins/alsa/alsa-pcm-device.c
@@ -48,6 +48,13 @@ struct impl {
 
 	struct spa_log *log;
 
+	uint32_t info_all;
+	struct spa_device_info device_info;
+
+#define IDX_EnumProfile		0
+#define IDX_Profile		1
+	struct spa_param_info params[2];
+
 	struct spa_hook_list hooks;
 
 	struct props props;
@@ -229,6 +236,9 @@ static int set_profile(struct impl *this, uint32_t id)
 	spa_log_debug(this->log, "done enumerating PCM nodes for card %s", this->props.device);
 	snd_ctl_close(ctl_hndl);
 
+	this->device_info.change_mask |= SPA_DEVICE_CHANGE_MASK_PARAMS;
+	this->params[IDX_Profile].user++;
+
 	return err;
 }
 
@@ -239,51 +249,54 @@ static int emit_info(struct impl *this, bool full)
 	uint32_t n_items = 0;
 	snd_ctl_t *ctl_hndl;
 	snd_ctl_card_info_t *info;
-	struct spa_device_info dinfo;
-	struct spa_param_info params[2];
 	char path[128];
 
-	spa_log_debug(this->log, "open card %s", this->props.device);
-	if ((err = snd_ctl_open(&ctl_hndl, this->props.device, 0)) < 0) {
-		spa_log_error(this->log, "can't open control for card %s: %s",
-				this->props.device, snd_strerror(err));
-		return err;
-	}
+	if (full)
+		this->device_info.change_mask = this->info_all;
 
-	snd_ctl_card_info_alloca(&info);
-	if ((err = snd_ctl_card_info(ctl_hndl, info)) < 0) {
-		spa_log_error(this->log, "error hardware info: %s", snd_strerror(err));
-		goto exit;
-	}
+	if (this->device_info.change_mask) {
+		spa_log_debug(this->log, "open card %s", this->props.device);
+		if ((err = snd_ctl_open(&ctl_hndl, this->props.device, 0)) < 0) {
+			spa_log_error(this->log, "can't open control for card %s: %s",
+					this->props.device, snd_strerror(err));
+			return err;
+		}
 
-	dinfo = SPA_DEVICE_INFO_INIT();
-
-	dinfo.change_mask = SPA_DEVICE_CHANGE_MASK_PROPS;
+		snd_ctl_card_info_alloca(&info);
+		if ((err = snd_ctl_card_info(ctl_hndl, info)) < 0) {
+			spa_log_error(this->log, "error hardware info: %s", snd_strerror(err));
+			goto exit;
+		}
 
 #define ADD_ITEM(key, value) items[n_items++] = SPA_DICT_ITEM_INIT(key, value)
-	snprintf(path, sizeof(path), "alsa:pcm:%s", snd_ctl_card_info_get_id(info));
-	ADD_ITEM(SPA_KEY_OBJECT_PATH, path);
-	ADD_ITEM(SPA_KEY_DEVICE_API, "alsa:pcm");
-	ADD_ITEM(SPA_KEY_MEDIA_CLASS, "Audio/Device");
-	ADD_ITEM(SPA_KEY_API_ALSA_PATH,	(char *)this->props.device);
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_ID, snd_ctl_card_info_get_id(info));
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_COMPONENTS, snd_ctl_card_info_get_components(info));
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_DRIVER, snd_ctl_card_info_get_driver(info));
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_NAME, snd_ctl_card_info_get_name(info));
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_LONGNAME, snd_ctl_card_info_get_longname(info));
-	ADD_ITEM(SPA_KEY_API_ALSA_CARD_MIXERNAME, snd_ctl_card_info_get_mixername(info));
-	dinfo.props = &SPA_DICT_INIT(items, n_items);
+		snprintf(path, sizeof(path), "alsa:pcm:%s", snd_ctl_card_info_get_id(info));
+		ADD_ITEM(SPA_KEY_OBJECT_PATH, path);
+		ADD_ITEM(SPA_KEY_DEVICE_API, "alsa:pcm");
+		ADD_ITEM(SPA_KEY_MEDIA_CLASS, "Audio/Device");
+		ADD_ITEM(SPA_KEY_API_ALSA_PATH,	(char *)this->props.device);
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_ID, snd_ctl_card_info_get_id(info));
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_COMPONENTS, snd_ctl_card_info_get_components(info));
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_DRIVER, snd_ctl_card_info_get_driver(info));
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_NAME, snd_ctl_card_info_get_name(info));
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_LONGNAME, snd_ctl_card_info_get_longname(info));
+		ADD_ITEM(SPA_KEY_API_ALSA_CARD_MIXERNAME, snd_ctl_card_info_get_mixername(info));
+		this->device_info.props = &SPA_DICT_INIT(items, n_items);
 #undef ADD_ITEM
 
-	dinfo.change_mask |= SPA_DEVICE_CHANGE_MASK_PARAMS;
-	params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumProfile, SPA_PARAM_INFO_READ);
-	params[1] = SPA_PARAM_INFO(SPA_PARAM_Profile, SPA_PARAM_INFO_READWRITE);
-	dinfo.n_params = SPA_N_ELEMENTS(params);
-	dinfo.params = params;
+		if (this->device_info.change_mask & SPA_DEVICE_CHANGE_MASK_PARAMS) {
+			SPA_FOR_EACH_ELEMENT_VAR(this->params, p) {
+				if (p->user > 0) {
+					p->flags ^= SPA_PARAM_INFO_SERIAL;
+					p->user = 0;
+				}
+			}
+		}
 
-	spa_device_emit_info(&this->hooks, &dinfo);
+		spa_device_emit_info(&this->hooks, &this->device_info);
+		this->device_info.change_mask = 0;
+	}
 
-      exit:
+exit:
 	spa_log_debug(this->log, "close card %s", this->props.device);
 	snd_ctl_close(ctl_hndl);
 	return err;
@@ -471,7 +484,9 @@ static int impl_set_param(void *object,
 			spa_log_warn(this->log, "unknown profile %s", name);
 			return -EINVAL;
 		}
+
 		set_profile(this, idx);
+		emit_info(this, false);
 		break;
 	}
 	default:
@@ -551,6 +566,15 @@ impl_init(const struct spa_handle_factory *factory,
 	if (info && (str = spa_dict_lookup(info, SPA_KEY_API_ALSA_PATH)))
 		snprintf(this->props.device, 64, "%s", str);
 
+	this->device_info = SPA_DEVICE_INFO_INIT();
+	this->info_all = SPA_DEVICE_CHANGE_MASK_PROPS |
+		SPA_DEVICE_CHANGE_MASK_PARAMS;
+
+	this->params[IDX_EnumProfile] = SPA_PARAM_INFO(SPA_PARAM_EnumProfile, SPA_PARAM_INFO_READ);
+	this->params[IDX_Profile] = SPA_PARAM_INFO(SPA_PARAM_Profile, SPA_PARAM_INFO_READWRITE);
+	this->device_info.params = this->params;
+	this->device_info.n_params = SPA_N_ELEMENTS(this->params);
+
 	return 0;
 }