4 files changed, 28 insertions, 8 deletions
diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index 37419d98..856adb14 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -1698,10 +1698,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         goto fail;
     }
 
-    if (use_tsched && !pa_rtclock_hrtimer()) {
-        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
-        use_tsched = FALSE;
-    }
+    use_tsched = pa_alsa_may_tsched(use_tsched);
 
     u = pa_xnew0(struct userdata, 1);
     u->core = m->core;
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index 37dd6476..e775b20c 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1541,10 +1541,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         goto fail;
     }
 
-    if (use_tsched && !pa_rtclock_hrtimer()) {
-        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
-        use_tsched = FALSE;
-    }
+    use_tsched = pa_alsa_may_tsched(use_tsched);
 
     u = pa_xnew0(struct userdata, 1);
     u->core = m->core;
diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
index 0e22d17e..b8d13575 100644
--- a/src/modules/alsa/alsa-util.c
+++ b/src/modules/alsa/alsa-util.c
@@ -43,6 +43,7 @@
 #include <pulsecore/once.h>
 #include <pulsecore/thread.h>
 #include <pulsecore/conf-parser.h>
+#include <pulsecore/core-rtclock.h>
 
 #include "alsa-util.h"
 #include "alsa-mixer.h"
@@ -1308,3 +1309,26 @@ const char* pa_alsa_strerror(int errnum) {
 
     return translated;
 }
+
+pa_bool_t pa_alsa_may_tsched(pa_bool_t want) {
+
+    if (!want)
+        return FALSE;
+
+    if (!pa_rtclock_hrtimer()) {
+        /* We cannot depend on being woken up in time when the timers
+        are inaccurate, so let's fallback to classic IO based playback
+        then. */
+        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
+        return FALSE; }
+
+    if (pa_running_in_vm()) {
+        /* We cannot depend on being woken up when we ask for in a VM,
+         * so let's fallback to classic IO based playback then. */
+        pa_log_notice("Disabling timer-based scheduling because running inside a VM.");
+        return FALSE;
+    }
+
+
+    return TRUE;
+}
diff --git a/src/modules/alsa/alsa-util.h b/src/modules/alsa/alsa-util.h
index f6206fe2..1d1256bd 100644
--- a/src/modules/alsa/alsa-util.h
+++ b/src/modules/alsa/alsa-util.h
@@ -142,4 +142,6 @@ pa_bool_t pa_alsa_pcm_is_modem(snd_pcm_t *pcm);
 
 const char* pa_alsa_strerror(int errnum);
 
+pa_bool_t pa_alsa_may_tsched(pa_bool_t want);
+
 #endif