FAILED: patch "[PATCH] ALSA: hda: conexant: Remove mic bias threshold override" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x f52524da7084c1a54683ae9fbc73e93fff19dd64
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026072003-jargon-yeah-7882@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f52524da7084c1a54683ae9fbc73e93fff19dd64 Mon Sep 17 00:00:00 2001
From: Zhang Heng <[email protected]>
Date: Mon, 13 Jul 2026 18:03:29 +0800
Subject: [PATCH] ALSA: hda: conexant: Remove mic bias threshold override

Remove the mic bias current comparator threshold override (NID 0x1c, verb 0x320, value 0x010) from Conexant codec driver.

This override was originally intended to support volume up/down controls on headsets with inline remote controls, but it causes microphone detection failures on some headsets with impedance less than 1k ohm.

After consulting with the vendor's engineers, it was confirmed that this setting is board-specific and should be handled by BIOS/firmware rather than the generic codec driver, especially since inline remote support is not currently implemented.

index 3d92262763f6..40da2832ba66 100644
@@ -162,9 +162,6 @@ static void cx_fixup_headset_recog(struct hda_codec *codec)
 {
 	unsigned int mic_present;
 
-	/* fix some headset type recognize fail issue, such as EDIFIER headset */
-	/* set micbias output current comparator threshold from 66% to 55%. */
-	snd_hda_codec_write(codec, 0x1c, 0, 0x320, 0x010);
 	/* set OFF voltage for DFET from -1.2V to -0.8V, set headset micbias register
 	 * value adjustment trim from 2.2K ohms to 2.0K ohms.
 	 */

From: Zhang Heng <[email protected]>

[ Upstream commit f52524da7084c1a54683ae9fbc73e93fff19dd64 ]

Remove the mic bias current comparator threshold override (NID 0x1c, verb 0x320, value 0x010) from Conexant codec driver.

This override was originally intended to support volume up/down controls on headsets with inline remote controls, but it causes microphone detection failures on some headsets with impedance less than 1k ohm.

After consulting with the vendor's engineers, it was confirmed that this setting is board-specific and should be handled by BIOS/firmware rather than the generic codec driver, especially since inline remote support is not currently implemented.

---
 sound/pci/hda/patch_conexant.c | 3 ---
 1 file changed, 3 deletions(-)

index 82186c4364c9b8..0aed86820402c5 100644
@@ -168,9 +168,6 @@ static void cx_fixup_headset_recog(struct hda_codec *codec)
 {
 	unsigned int mic_present;
 
-	/* fix some headset type recognize fail issue, such as EDIFIER headset */
-	/* set micbias output current comparator threshold from 66% to 55%. */
-	snd_hda_codec_write(codec, 0x1c, 0, 0x320, 0x010);
 	/* set OFF voltage for DFET from -1.2V to -0.8V, set headset micbias register
 	 * value adjustment trim from 2.2K ohms to 2.0K ohms.
 	 */

2.53.0