{ 0x414c4723, 0xffffffff, "ALC650F",           NULL,   NULL }, /* already patched */
 { 0x414c4720, 0xfffffff0, "ALC650",            patch_alc650,   NULL },
 { 0x414c4760, 0xfffffff0, "ALC655",            patch_alc655,   NULL },
+{ 0x414c4781, 0xffffffff, "ALC658D",           NULL,   NULL }, /* already patched */
 { 0x414c4780, 0xfffffff0, "ALC658",            patch_alc655,   NULL },
 { 0x414c4790, 0xfffffff0, "ALC850",            patch_alc850,   NULL },
 { 0x414c4730, 0xffffffff, "ALC101",            NULL,           NULL },
 
 #define AC97_ID_ALC650F                0x414c4723
 #define AC97_ID_ALC655         0x414c4760
 #define AC97_ID_ALC658         0x414c4780
+#define AC97_ID_ALC658D                0x414c4781
 #define AC97_ID_ALC850         0x414c4790
 #define AC97_ID_YMF753         0x594d4803
 #define AC97_ID_VT1616         0x49434551
 
 {
        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;
 
 
        /* 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 &&
        /* 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;
 }