1 files changed, 13 insertions, 2 deletions

diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index 0acf51dd4478..045ddc743edc 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -2134,7 +2134,13 @@ int patch_alc655(ac97_t * ac97)
 {
         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 @@ int patch_alc655(ac97_t * ac97)
 
         /* 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 @@ int patch_alc655(ac97_t * ac97)
         /* 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;
 }