[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/Documentation/sound/cards/via82xx-mixer.rst b/src/kernel/linux/v4.14/Documentation/sound/cards/via82xx-mixer.rst
new file mode 100644
index 0000000..6ee993d
--- /dev/null
+++ b/src/kernel/linux/v4.14/Documentation/sound/cards/via82xx-mixer.rst
@@ -0,0 +1,8 @@
+=============
+VIA82xx mixer
+=============
+
+On many VIA82xx boards, the ``Input Source Select`` mixer control does not work.
+Setting it to ``Input2`` on such boards will cause recording to hang, or fail
+with EIO (input/output error) via OSS emulation. This control should be left
+at ``Input1`` for such cards.