[alsa-devel] Intel HDA audio on EEE PC 1101HGo

[Takashi Iwai]

On Sat, 14 Jan 2017 10:20:16 +0100,
Enrico Mioso wrote:
> 
> Hello Takashi,
> thank you very much again for your kindness and patience...
> 
> I'll enable the tracepoint.
> Discrepancies in the single_cmd value are derived from the fact that I am still using the hackish version of the patch, since I didn't reboot... otherwise I should have started from scratch some very-long operations.
> But the value has remained to 0, and the fallback didn't happen, as expected.
> 
> Ok, reading note.rst now.
> I was wondering, but I may well be wrong: in the past that fallback code brought my system to single cmd mode after polling... Now it crashes, and as I said before, the switching from polling to last_cmd is kind-of immediate most of the times these days (e.g.: on this kernel).
> May be something goes wrong in the fallback path? Or is this caused by an invalid verb ?
> Guessing verb = something like a command...

Yes, maybe the fallback to single cmd got broken somehow.  I'd need to
check with a fault injection.

In anyway, the verb is DIGI_CONVERT_2, and the only possible place is
the beep setup.

Could you try the below to see whether it makes any difference?


Takashi

---
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
index c397e7da0eac..07930e69812a 100644
--- a/sound/pci/hda/hda_beep.c
+++ b/sound/pci/hda/hda_beep.c
@@ -228,9 +228,11 @@ int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
 		return -ENOMEM;
 	snprintf(beep->phys, sizeof(beep->phys),
 		"card%d/codec#%d/beep0", codec->card->number, codec->addr);
+#if 0
 	/* enable linear scale */
 	snd_hda_codec_write_cache(codec, nid, 0,
 		AC_VERB_SET_DIGI_CONVERT_2, 0x01);
+#endif
 
 	beep->nid = nid;
 	beep->codec = codec;