[ALSA] Fix ALC658D support

AC97 Codec
Fix the internal speaker problem (e.g. Targa Traveller 826)
with ALC658D codec.  The info is taken from Cyberlink/realtek-modified code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index 0acf51d..045ddc7 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -2134,7 +2134,13 @@
 {
 	unsigned int val;
 
-	ac97->spec.dev_flags = (ac97->id == 0x414c4780); /* ALC658 */
+	if (ac97->id == AC97_ID_ALC658) {
+		ac97->spec.dev_flags = 1; /* ALC658 */
+		if ((snd_ac97_read(ac97, AC97_ALC650_REVISION) & 0x3f) == 2) {
+			ac97->id = AC97_ID_ALC658D;
+			ac97->spec.dev_flags = 2;
+		}
+	}
 
 	ac97->build_ops = &patch_alc655_ops;
 
@@ -2143,7 +2149,7 @@
 
 	/* adjust default values */
 	val = snd_ac97_read(ac97, 0x7a); /* misc control */
-	if (ac97->id == 0x414c4780) /* ALC658 */
+	if (ac97->spec.dev_flags) /* ALC658 */
 		val &= ~(1 << 1); /* Pin 47 is spdif input pin */
 	else { /* ALC655 */
 		if (ac97->subsystem_vendor == 0x1462 &&
@@ -2164,6 +2170,11 @@
 	/* full DAC volume */
 	snd_ac97_write_cache(ac97, AC97_ALC650_SURR_DAC_VOL, 0x0808);
 	snd_ac97_write_cache(ac97, AC97_ALC650_LFE_DAC_VOL, 0x0808);
+
+	/* update undocumented bit... */
+	if (ac97->id == AC97_ID_ALC658D)
+		snd_ac97_update_bits(ac97, 0x74, 0x0800, 0x0800);
+
 	return 0;
 }