The COEF setup for model=auto seems problematic on some laptops,
resulting in the silent speaker output.  Better to disable it for now.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
                case 0x10ec0888:
                        alc888_coef_init(codec);
                        break;
+#if 0 /* XXX: This may cause the silent output on speaker on some machines */
                case 0x10ec0267:
                case 0x10ec0268:
                        snd_hda_codec_write(codec, 0x20, 0,
                                            AC_VERB_SET_PROC_COEF,
                                            tmp | 0x3000);
                        break;
+#endif /* XXX */
                }
                break;
        }