diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 07fd630db88d..304025b23520 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -317,7 +317,7 @@ struct snd_pcm_runtime {
 	struct snd_pcm_mmap_control *control;
 
 	/* -- locking / scheduling -- */
-	unsigned int twake: 1;		/* do transfer (!poll) wakeup */
+	snd_pcm_uframes_t twake; 	/* do transfer (!poll) wakeup if non-zero */
 	wait_queue_head_t sleep;	/* poll sleep */
 	wait_queue_head_t tsleep;	/* transfer sleep */
 	struct fasync_struct *fasync;
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index e9d98be190c5..bcf95d3ff5c7 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -287,8 +287,11 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream,
 			return -EPIPE;
 		}
 	}
-	if (avail >= runtime->control->avail_min)
-		wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep);
+	if (runtime->twake) {
+		if (avail >= runtime->twake)
+			wake_up(&runtime->tsleep);
+	} else if (avail >= runtime->control->avail_min)
+		wake_up(&runtime->sleep);
 	return 0;
 }
 
@@ -1707,7 +1710,7 @@ EXPORT_SYMBOL(snd_pcm_period_elapsed);
  * The available space is stored on availp.  When err = 0 and avail = 0
  * on the capture stream, it indicates the stream is in DRAINING state.
  */
-static int wait_for_avail_min(struct snd_pcm_substream *substream,
+static int wait_for_avail(struct snd_pcm_substream *substream,
 			      snd_pcm_uframes_t *availp)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
@@ -1757,7 +1760,7 @@ static int wait_for_avail_min(struct snd_pcm_substream *substream,
 			avail = snd_pcm_playback_avail(runtime);
 		else
 			avail = snd_pcm_capture_avail(runtime);
-		if (avail >= runtime->control->avail_min)
+		if (avail >= runtime->twake)
 			break;
 	}
  _endloop:
@@ -1820,7 +1823,7 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 		goto _end_unlock;
 	}
 
-	runtime->twake = 1;
+	runtime->twake = runtime->control->avail_min ? : 1;
 	while (size > 0) {
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
@@ -1833,7 +1836,9 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
 				err = -EAGAIN;
 				goto _end_unlock;
 			}
-			err = wait_for_avail_min(substream, &avail);
+			runtime->twake = min_t(snd_pcm_uframes_t, size,
+					runtime->control->avail_min ? : 1);
+			err = wait_for_avail(substream, &avail);
 			if (err < 0)
 				goto _end_unlock;
 		}
@@ -2042,7 +2047,7 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 		goto _end_unlock;
 	}
 
-	runtime->twake = 1;
+	runtime->twake = runtime->control->avail_min ? : 1;
 	while (size > 0) {
 		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
 		snd_pcm_uframes_t avail;
@@ -2060,7 +2065,9 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
 				err = -EAGAIN;
 				goto _end_unlock;
 			}
-			err = wait_for_avail_min(substream, &avail);
+			runtime->twake = min_t(snd_pcm_uframes_t, size,
+					runtime->control->avail_min ? : 1);
+			err = wait_for_avail(substream, &avail);
 			if (err < 0)
 				goto _end_unlock;
 			if (!avail)
diff --git a/sound/pci/sis7019.c b/sound/pci/sis7019.c
index 9cc1b5aa0148..1b8f6742b5fa 100644
--- a/sound/pci/sis7019.c
+++ b/sound/pci/sis7019.c
@@ -264,11 +264,13 @@ static void sis_update_voice(struct voice *voice)
 		 * if using small periods.
 		 *
 		 * If we're less than 9 samples behind, we're on target.
+		 * Otherwise, shorten the next vperiod by the amount we've
+		 * been delayed.
 		 */
 		if (sync > -9)
 			voice->vperiod = voice->sync_period_size + 1;
 		else
-			voice->vperiod = voice->sync_period_size - 4;
+			voice->vperiod = voice->sync_period_size + sync + 10;
 
 		if (voice->vperiod < voice->buffer_size) {
 			sis_update_sso(voice, voice->vperiod);
@@ -736,7 +738,7 @@ static void sis_prepare_timing_voice(struct voice *voice,
 	period_size = buffer_size;
 
 	/* Initially, we want to interrupt just a bit behind the end of
-	 * the period we're clocking out. 10 samples seems to give a good
+	 * the period we're clocking out. 12 samples seems to give a good
 	 * delay.
 	 *
 	 * We want to spread our interrupts throughout the virtual period,
@@ -747,7 +749,7 @@ static void sis_prepare_timing_voice(struct voice *voice,
 	 *
 	 * This is all moot if we don't need to use virtual periods.
 	 */
-	vperiod = runtime->period_size + 10;
+	vperiod = runtime->period_size + 12;
 	if (vperiod > period_size) {
 		u16 tail = vperiod % period_size;
 		u16 quarter_period = period_size / 4;
@@ -776,7 +778,7 @@ static void sis_prepare_timing_voice(struct voice *voice,
 	 */
 	timing->flags |= VOICE_SYNC_TIMING;
 	timing->sync_base = voice->ctrl_base;
-	timing->sync_cso = runtime->period_size - 1;
+	timing->sync_cso = runtime->period_size;
 	timing->sync_period_size = runtime->period_size;
 	timing->sync_buffer_size = runtime->buffer_size;
 	timing->period_size = period_size;
@@ -1047,7 +1049,7 @@ static int sis_chip_free(struct sis7019 *sis)
 	/* Reset the chip, and disable all interrputs.
 	 */
 	outl(SIS_GCR_SOFTWARE_RESET, sis->ioport + SIS_GCR);
-	udelay(10);
+	udelay(25);
 	outl(0, sis->ioport + SIS_GCR);
 	outl(0, sis->ioport + SIS_GIER);
 
@@ -1083,7 +1085,7 @@ static int sis_chip_init(struct sis7019 *sis)
 	/* Reset the audio controller
 	 */
 	outl(SIS_GCR_SOFTWARE_RESET, io + SIS_GCR);
-	udelay(10);
+	udelay(25);
 	outl(0, io + SIS_GCR);
 
 	/* Get the AC-link semaphore, and reset the codecs
@@ -1096,7 +1098,7 @@ static int sis_chip_init(struct sis7019 *sis)
 		return -EIO;
 
 	outl(SIS_AC97_CMD_CODEC_COLD_RESET, io + SIS_AC97_CMD);
-	udelay(10);
+	udelay(250);
 
 	count = 0xffff;
 	while ((inw(io + SIS_AC97_STATUS) & SIS_AC97_STATUS_BUSY) && --count)