diff --git a/sound/isa/es1688/es1688_lib.c b/sound/isa/es1688/es1688_lib.c
index 5c26d49..eb35267 100644
--- a/sound/isa/es1688/es1688_lib.c
+++ b/sound/isa/es1688/es1688_lib.c
@@ -368,9 +368,11 @@ static int snd_es1688_playback_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
 	unsigned int count = snd_pcm_lib_period_bytes(substream);
+	int tmp;
 
 	chip->dma_size = size;
 	spin_lock_irqsave(&chip->reg_lock, flags);
+	tmp = snd_es1688_read(chip, 0xb4);
 	snd_es1688_reset(chip);
 	snd_es1688_set_rate(chip, substream);
 	snd_es1688_write(chip, 0xb8, 4);	/* auto init DMA mode */
@@ -403,6 +405,7 @@ static int snd_es1688_playback_prepare(struct snd_pcm_substream *substream)
 	}
 	snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
 	snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
+	snd_es1688_write(chip, 0xb4, tmp);
 	snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKON);
 	spin_unlock_irqrestore(&chip->reg_lock, flags);
 	/* --- */
@@ -429,9 +432,11 @@ static int snd_es1688_capture_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
 	unsigned int count = snd_pcm_lib_period_bytes(substream);
+	int tmp;
 
 	chip->dma_size = size;
 	spin_lock_irqsave(&chip->reg_lock, flags);
+	tmp = snd_es1688_read(chip, 0xb4);
 	snd_es1688_reset(chip);
 	snd_es1688_set_rate(chip, substream);
 	snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKOFF);
@@ -461,6 +466,7 @@ static int snd_es1688_capture_prepare(struct snd_pcm_substream *substream)
 	}
 	snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
 	snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
+	snd_es1688_write(chip, 0xb4, tmp);
 	spin_unlock_irqrestore(&chip->reg_lock, flags);
 	/* --- */
 	count = -count;