This is a note to let you know that I've just added the patch titled

ALSA: hda - Fix missing COEF init for ALC225/295/299

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: alsa-hda-fix-missing-coef-init-for-alc225-295-299.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 44be77c590f381bc629815ac789b8b15ecc4ddcf Mon Sep 17 00:00:00 2001

From: Takashi Iwai tiwai@suse.de Date: Wed, 27 Dec 2017 08:53:59 +0100 Subject: ALSA: hda - Fix missing COEF init for ALC225/295/299

From: Takashi Iwai tiwai@suse.de

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.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195457 Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- 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); break; - 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); break; case 0x10ec0275:

Patches currently in stable-queue which might be from tiwai@suse.de are

queue-4.14/alsa-hda-drop-useless-warn_on.patch queue-4.14/alsa-hda-fix-missing-coef-init-for-alc225-295-299.patch queue-4.14/alsa-hda-fix-headset-mic-detection-issue-on-a-dell-machine.patch queue-4.14/alsa-hda-change-the-location-for-one-mic-on-a-lenovo-machine.patch queue-4.14/alsa-hda-add-mic_no_presence-fixup-for-2-hp-machines.patch