[alsa-devel] regression: from 3.8 to 3.9: headphones output no sound on Intel HDA, codec VIA VT1802

Takashi Iwai tiwai at suse.de
Wed May 29 17:42:49 CEST 2013

At Fri, 24 May 2013 23:32:14 +0200,
Alex Riesen wrote:
> On Fri, May 24, 2013 at 7:22 PM, Takashi Iwai <tiwai at suse.de> wrote:
> >
> > Well, I assumed that the EAPD off triggers the pin widget off by the
> > hardware, too.  But it seems wrong.  By some reason, the hardware
> > clears the pin automatically.  Hmm.
> >
> > Could you try to trace the verbs while plugging the headphone?
> Attached, it's ~70k, so compressed again.


Looking at this, surprisingly there is a verb to set the pinctl to
0x00 indeed.  This didn't happen on the emulator I checked.  So we
need to figure out from where this came.

> >> I did, it does not work. Transcript and alsa-info before and after
> >> hda-verb attached.
> >
> > OK, I'll cook up the new patch later.
> I'm sorry to say that I will not be able to test it in the next
> 8 or so days: I'll be traveling and without this particular laptop
> with me. I hope someone with similar model (Sytem76 Lemur lemu4, i7)
> can provide some testing in the meantime. Otherwise, I'll test
> it as soon as I get back.

Don't worry, the bug is more difficult than I thought :)
We can fix it quickly but it's no real fix.  Better to know the real

When you back, could you try the following and give the outputs?

0. Build the kernel with the patch below.  Discard previous patches.
   Also, make sure that your kernel has CONFIG_SND_HDA_HWDEP=y and
1. Blacklist snd-hda-intel module in /etc/modprobe.d/* file,
   and reboot to runlevel 3.

2. Load snd-hda-intel manually with probe_only=1 option
   # modprobe snd-hda-intel probe_only=1

3. Run "alsa-info.sh --no-upload" at this moment, and save it.

4. Enable the tracing.
   # echo 1 > /sys/kernel/debug/tracing/events/hda/enable

5. Configure the codec via below (don't plug in HP yet):
   # echo 1 > /sys/class/sound/hwC0D0/reconfig

   Copy the tracing output to somewhere
   # cp /sys/kernel/debug/tracing/trace /tmp/init-trace

   then clear the trace buffer.
   # echo > /sys/kernel/debug/tracing/trace

6. Now you should have the normal sound operation.
   Try to play something, and confirm the speaker output is working.
   Get alsa-info.sh output at this state.

   Again copy the trace buffer and clear
   # cp /sys/kernel/debug/tracing/trace /tmp/speaker-trace
   # echo > /sys/kernel/debug/tracing/trace

7. Plug the headphone, and copy the trace.

   # cp /sys/kernel/debug/tracing/trace /tmp/headphone-trace
   # echo > /sys/kernel/debug/tracing/trace

   Check whether the playback doesn't work on the headphone at this
   moment.  Get alsa-info.sh output again.

8. Run some hda-verb to enable EAPD and pin-control, confirm the
   headphone is working now, and get alsa-info.sh output.

So, you'll get 4 alsa-info.sh outputs (step 3, 6, 7 and 8), and 4
trace logs (step 5, 6 and 7).



diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index ae85bbd2..5ca6655 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -5092,7 +5092,7 @@ int snd_hda_gen_init(struct hda_codec *codec)
-	codec->cached_write = 1;
+	// codec->cached_write = 1;
diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index e0dadcf..8d861c3 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -231,9 +231,11 @@ static void vt1708_update_hp_work(struct hda_codec *codec)
 static void set_widgets_power_state(struct hda_codec *codec)
+#if 0
 	struct via_spec *spec = codec->spec;
 	if (spec->set_widgets_power_state)
 static void update_power_state(struct hda_codec *codec, hda_nid_t nid,

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