This is a note to let you know that I've just added the patch titled ALSA: hda/realtek - Couldn't detect Mic if booting with headset plugged to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alsa-hda-realtek-couldn-t-detect-mic-if-booting-with-headset-plugged.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 3f74249057827c5f6676c41c18f6be12ce1469ce Mon Sep 17 00:00:00 2001 From: Hui Wang <hui.wang@xxxxxxxxxxxxx> Date: Mon, 14 Sep 2020 14:51:18 +0800 Subject: ALSA: hda/realtek - Couldn't detect Mic if booting with headset plugged From: Hui Wang <hui.wang@xxxxxxxxxxxxx> commit 3f74249057827c5f6676c41c18f6be12ce1469ce upstream. We found a Mic detection issue on many Lenovo laptops, those laptops belong to differnt models and they have different audio design like internal mic connects to the codec or PCH, they all have this problem, the problem is if plugging a headset before powerup/reboot the machine, after booting up, the headphone could be detected but Mic couldn't. If we plug out and plug in the headset, both headphone and Mic could be detected then. Through debugging we found the codec on those laptops are same, it is alc257, and if we don't disable the 3k pulldown in alc256_shutup(), the issue will be fixed. So far there is no pop noise or power consumption regression on those laptops after this change. Cc: Kailang Yang <kailang@xxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200914065118.19238-1-hui.wang@xxxxxxxxxxxxx Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/pci/hda/patch_realtek.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -3418,7 +3418,11 @@ static void alc256_shutup(struct hda_cod /* 3k pull low control for Headset jack. */ /* NOTE: call this before clearing the pin, otherwise codec stalls */ - alc_update_coef_idx(codec, 0x46, 0, 3 << 12); + /* If disable 3k pulldown control for alc257, the Mic detection will not work correctly + * when booting with headset plugged. So skip setting it for the codec alc257 + */ + if (codec->core.vendor_id != 0x10ec0257) + alc_update_coef_idx(codec, 0x46, 0, 3 << 12); if (!spec->no_shutup_pins) snd_hda_codec_write(codec, hp_pin, 0, Patches currently in stable-queue which might be from hui.wang@xxxxxxxxxxxxx are queue-5.4/alsa-hda-realtek-enable-front-panel-headset-led-on-lenovo-thinkstation-p520.patch queue-5.4/alsa-hda-realtek-couldn-t-detect-mic-if-booting-with-headset-plugged.patch