Below (as well as attached) is my patch, for the 0x814e variant of the ASUS P5GD1 w/SPDIF.

diff -r e2b60934d1c8 pci/hda/patch_realtek.c --- a/pci/hda/patch_realtek.c Mon May 19 12:32:25 2008 +0200 +++ b/pci/hda/patch_realtek.c Tue May 20 01:50:04 2008 +1000 @@ -2981,7 +2981,7 @@ static struct snd_pci_quirk alc880_cfg_t /* SND_PCI_QUIRK(0x1043, 0x1964, "ASUS", ALC880_ASUS_DIG), */ SND_PCI_QUIRK(0x1043, 0x1973, "ASUS", ALC880_ASUS_DIG), SND_PCI_QUIRK(0x1043, 0x19b3, "ASUS", ALC880_ASUS_DIG), - SND_PCI_QUIRK(0x1043, 0x814e, "ASUS", ALC880_ASUS), + SND_PCI_QUIRK(0x1043, 0x814e, "ASUS P5GD1 w/SPDIF", ALC880_6ST_DIG), SND_PCI_QUIRK(0x1043, 0x8181, "ASUS P4GPL", ALC880_ASUS_DIG), SND_PCI_QUIRK(0x1043, 0x8196, "ASUS P5GD1", ALC880_6ST), SND_PCI_QUIRK(0x1043, 0x81b4, "ASUS", ALC880_6ST),

Changelog:

Corrected the model assignment for the ASUS P5GD1 w/SPDIF after reports of surround sound not being possible.

Signed-off-by: Travis Place <wishie at wishie dot net>