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Date:   Tue, 21 Aug 2018 08:20:49 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Park Ju Hyung <>,
        Takashi Iwai <>
Subject: [PATCH 4.17 17/42] ALSA: hda - Sleep for 10ms after entering D3 on Conexant codecs

4.17-stable review patch.  If anyone has any objections, please let me know.


From: Park Ju Hyung <>

commit f59cf9a0551dd954ad8b752461cf19d9789f4b1d upstream.

On rare occasions, we are still noticing that the internal speaker
spitting out spurious noises even after adding the problematic codec
to the list.

Adding a 10ms artificial delay before rebooting fixes the issue entirely.

Patch for Realtek codecs also adds the same amount of delay after
entering D3.

Signed-off-by: Park Ju Hyung <>
Cc: <>
Signed-off-by: Takashi Iwai <>
Signed-off-by: Greg Kroah-Hartman <>

 sound/pci/hda/patch_conexant.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -225,6 +225,7 @@ static void cx_auto_reboot_notify(struct
 	snd_hda_codec_set_power_to_all(codec, codec->core.afg, AC_PWRST_D3);
 	snd_hda_codec_write(codec, codec->core.afg, 0,
+	msleep(10);
 static void cx_auto_free(struct hda_codec *codec)

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