ALSA: Fix AC97 power down

Some laptops don't like PR3 powerdown.  Do PR3 powerdown only
for the real power-saving.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 2d2f16e11082..07364c00768a 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -2295,9 +2295,11 @@ static void snd_ac97_powerdown(struct snd_ac97 *ac97)
         power |= AC97_PD_PR0 | AC97_PD_PR1;     /* ADC & DAC powerdown */
         snd_ac97_write(ac97, AC97_POWERDOWN, power);
         udelay(100);
-        power |= AC97_PD_PR2 | AC97_PD_PR3;     /* Analog Mixer powerdown */
+        power |= AC97_PD_PR2;   /* Analog Mixer powerdown (Vref on) */
         snd_ac97_write(ac97, AC97_POWERDOWN, power);
         if (ac97_is_power_save_mode(ac97)) {
+                power |= AC97_PD_PR3;   /* Analog Mixer powerdown */
+                snd_ac97_write(ac97, AC97_POWERDOWN, power);
                 udelay(100);
                 /* AC-link powerdown, internal Clk disable */
                 /* FIXME: this may cause click noises on some boards */