Patch "rt286: add Thinkpad Helix 2 to force_combo_jack_table" has been added to the 4.9-stable tree

Patch "rt286: add Thinkpad Helix 2 to force_combo_jack_table" has been added to the 4.9-stable tree

[gregkh]

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

    rt286: add Thinkpad Helix 2 to force_combo_jack_table

to the 4.9-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:
     rt286-add-thinkpad-helix-2-to-force_combo_jack_table.patch
and it can be found in the queue-4.9 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 fe0dfd6358a17c79bd7d6996af7512ba452a7059 Mon Sep 17 00:00:00 2001
From: Yifeng Li <tomli@tomli.me>
Date: Thu, 4 May 2017 01:34:14 +0800
Subject: rt286: add Thinkpad Helix 2 to force_combo_jack_table

From: Yifeng Li <tomli@tomli.me>

commit fe0dfd6358a17c79bd7d6996af7512ba452a7059 upstream.

Thinkpad Helix 2 is a tablet PC, the audio is powered by Core M
broadwell-audio and rt286 codec. For all versions of Linux kernel,
the stereo output doesn't work properly when earphones are plugged
in, the sound was coming out from both channels even if the audio
contains only the left or right channel. Furthermore, if a music
recorded in stereo is played, the two channels cancle out each other
out, as a result, no voice but only distorted background music can be
heard, like a sound card with builtin a Karaoke sount effect.

Apparently this tablet uses a combo jack with polarity incorrectly
set by rt286 driver. This patch adds DMI information of Thinkpad Helix 2
to force_combo_jack_table[] and the issue is resolved. The microphone
input doesn't work regardless to the presence of this patch and still
needs help from other developers to investigate.

This is my first patch to LKML directly, sorry for CC-ing too many
people here.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=93841
Signed-off-by: Yifeng Li <tomli@tomli.me>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/codecs/rt286.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/sound/soc/codecs/rt286.c
+++ b/sound/soc/codecs/rt286.c
@@ -1108,6 +1108,13 @@ static const struct dmi_system_id force_
 			DMI_MATCH(DMI_PRODUCT_NAME, "Kabylake Client platform")
 		}
 	},
+	{
+		.ident = "Thinkpad Helix 2nd",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix 2nd")
+		}
+	},
 
 	{ }
 };


Patches currently in stable-queue which might be from tomli@tomli.me are

queue-4.9/rt286-add-thinkpad-helix-2-to-force_combo_jack_table.patch