3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Clemens Ladisch <clemens@ladisch.de>

commit f0e48b6bd4e407459715240cd241ddb6b89bdf81 upstream.

The two DACs for the front output and the surround/center/LFE/back
outputs are wired up out of phase, so when channels are duplicated,
their sound can cancel out each other and result in a weaker bass
response.  To fix this, reverse the polarity of the neutron flow to
the front output.

Reported-any-tested-by: Daniel Hill [off-list ref]
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 sound/pci/oxygen/xonar_wm87x6.c |    1 +
 1 file changed, 1 insertion(+)

--- a/sound/pci/oxygen/xonar_wm87x6.c
+++ b/sound/pci/oxygen/xonar_wm87x6.c

@@ -177,6 +177,7 @@ static void wm8776_registers_init(struct
 	struct xonar_wm87x6 *data = chip->model_data;
 
 	wm8776_write(chip, WM8776_RESET, 0);
+	wm8776_write(chip, WM8776_PHASESWAP, WM8776_PH_MASK);
 	wm8776_write(chip, WM8776_DACCTRL1, WM8776_DZCEN |
 		     WM8776_PL_LEFT_LEFT | WM8776_PL_RIGHT_RIGHT);
 	wm8776_write(chip, WM8776_DACMUTE, chip->dac_mute ? WM8776_DMUTE : 0);