ALSA: virtuoso: Xonar DS: fix polarity of front output
authorClemens Ladisch <clemens@ladisch.de>
Sat, 14 Jan 2012 15:42:24 +0000 (16:42 +0100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 26 Jan 2012 00:13:44 +0000 (16:13 -0800)
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 <daniel@enemyplanet.geek.nz>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
sound/pci/oxygen/xonar_wm87x6.c

index 42d1ab1..915546a 100644 (file)
@@ -177,6 +177,7 @@ static void wm8776_registers_init(struct oxygen *chip)
        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);