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Subject[PATCH 4.14 054/146] ALSA: hda - Fix missing COEF init for ALC225/295/299
4.14-stable review patch.  If anyone has any objections, please let me know.


From: Takashi Iwai <>

commit 44be77c590f381bc629815ac789b8b15ecc4ddcf upstream.

There was a long-standing problem on HP Spectre X360 with Kabylake
where it lacks of the front speaker output in some situations. Also
there are other products showing the similar behavior. The culprit
seems to be the missing COEF setup on ALC codecs, ALC225/295/299,
which are all compatible.

This patch adds the proper COEF setup (to initialize idx 0x67 / bits
0x3000) for addressing the issue.

Signed-off-by: Takashi Iwai <>
Signed-off-by: Greg Kroah-Hartman <>

sound/pci/hda/patch_realtek.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -324,8 +324,12 @@ static void alc_fill_eapd_coef(struct hd
case 0x10ec0292:
alc_update_coef_idx(codec, 0x4, 1<<15, 0);
- case 0x10ec0215:
case 0x10ec0225:
+ case 0x10ec0295:
+ case 0x10ec0299:
+ alc_update_coef_idx(codec, 0x67, 0xf000, 0x3000);
+ /* fallthrough */
+ case 0x10ec0215:
case 0x10ec0233:
case 0x10ec0236:
case 0x10ec0255:
@@ -336,10 +340,8 @@ static void alc_fill_eapd_coef(struct hd
case 0x10ec0286:
case 0x10ec0288:
case 0x10ec0285:
- case 0x10ec0295:
case 0x10ec0298:
case 0x10ec0289:
- case 0x10ec0299:
alc_update_coef_idx(codec, 0x10, 1<<9, 0);
case 0x10ec0275:

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