diff --git a/src/modules/alsa/alsa-mixer.c b/src/modules/alsa/alsa-mixer.c
index 7de1c7deb..02ab4a611 100644
--- a/src/modules/alsa/alsa-mixer.c
+++ b/src/modules/alsa/alsa-mixer.c
@@ -3505,6 +3505,7 @@ pa_alsa_mapping *pa_alsa_mapping_get(pa_alsa_profile_set *ps, const char *name)
     pa_sample_spec_init(&m->sample_spec);
     pa_channel_map_init(&m->channel_map);
     m->proplist = pa_proplist_new();
+    m->hw_device_index = -1;
 
     pa_hashmap_put(ps->mappings, m->name, m);
 
@@ -4532,6 +4533,25 @@ static int add_profiles_to_probe(
     return i;
 }
 
+static void mapping_query_hw_device(pa_alsa_mapping *mapping, snd_pcm_t *pcm) {
+    int r;
+    snd_pcm_info_t* pcm_info;
+    snd_pcm_info_alloca(&pcm_info);
+
+    r = snd_pcm_info(pcm, pcm_info);
+    if (r < 0) {
+        pa_log("Mapping %s: snd_pcm_info() failed %s: ", mapping->name, pa_alsa_strerror(r));
+        return;
+    }
+
+    /* XXX: It's not clear what snd_pcm_info_get_device() does if the device is
+     * not backed by a hw device or if it's backed by multiple hw devices. We
+     * only use hw_device_index for HDMI devices, however, and for those the
+     * return value is expected to be always valid, so this shouldn't be a
+     * significant problem. */
+    mapping->hw_device_index = snd_pcm_info_get_device(pcm_info);
+}
+
 void pa_alsa_profile_set_probe(
         pa_alsa_profile_set *ps,
         const char *dev_id,
@@ -4622,6 +4642,9 @@ void pa_alsa_profile_set_probe(
                         }
                         break;
                     }
+
+                    if (m->hw_device_index < 0)
+                        mapping_query_hw_device(m, m->output_pcm);
                 }
 
             if (p->input_mappings && p->supported)
@@ -4643,6 +4666,9 @@ void pa_alsa_profile_set_probe(
                         }
                         break;
                     }
+
+                    if (m->hw_device_index < 0)
+                        mapping_query_hw_device(m, m->input_pcm);
                 }
 
             last = p;
diff --git a/src/modules/alsa/alsa-mixer.h b/src/modules/alsa/alsa-mixer.h
index 3577f435f..0f1c5b91f 100644
--- a/src/modules/alsa/alsa-mixer.h
+++ b/src/modules/alsa/alsa-mixer.h
@@ -275,6 +275,10 @@ struct pa_alsa_mapping {
     bool exact_channels:1;
     bool fallback:1;
 
+    /* The "y" in "hw:x,y". This is set to -1 before the device index has been
+     * queried, or if the query failed. */
+    int hw_device_index;
+
     /* Temporarily used during probing */
     snd_pcm_t *input_pcm;
     snd_pcm_t *output_pcm;