diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index f378480..75515b4 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -2089,6 +2089,9 @@
 		codec_dbg(codec, "mute LED gpio %d polarity %d\n",
 				spec->gpio_led,
 				spec->gpio_led_polarity);
+
+	/* allow auto-switching of dock line-in */
+	spec->gen.line_in_auto_switch = true;
 }
 
 static void stac92hd83xxx_fixup_hp_zephyr(struct hda_codec *codec,