[alsa-devel] [PATCH] ALSA: hda/hdmi - Don't report Jack event if no need to do that

[Takashi Iwai]

On Tue, 30 Apr 2019 08:57:11 +0200,
Hui Wang wrote:
> 
> On the machines with AMD GPU or Nvidia GPU, we often meet this issues:
> after s3, there are 4 HDMI/DP audio devices in the gnome-sound-setting
> even there is no any monitors plugged.
> 
> When this problem happens, we check the /proc/asound/cardX/eld#N.M, we
> will find the monitor_present=1, eld_valid=0.
> 
> The root cause is somehow the pin_sense reports the monitor is present
> and eld is valid when there is no monitor plugged.
> 
> The current driver will read the eld data if the pin_sense reports the
> eld is valid, because of no monitor is plugged, there is no valid eld
> data, then the eld->valid is set to 0.
> 
> If we don't let driver report Jack event when monitor_present=1 while
> eld_valid=0, there will be no this issue.
> 
> After this change, the driver only reports Jack event with one of the
> below 2 conditons:
>  eld->monitor_present=1 and eld->eld_valid=1 (a valid monitor detect)
>  eld->monitor_present=0 (a monitor is unplugged)
> 
> Signed-off-by: Hui Wang <hui.wang at canonical.com>

Well, if the eld_valid=1 is mandatory, basically we can use it as the
condition of jack=1, like the patch below.  The return value from
hdmi_present_sense() indicates only whether we may sync jack state or
not, and it's not about the jack state itself.


thanks,

Takashi

---
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1625,7 +1625,7 @@ static void sync_eld_via_acomp(struct hda_codec *codec,
 	if (jack == NULL)
 		goto unlock;
 	snd_jack_report(jack,
-			eld->monitor_present ? SND_JACK_AVOUT : 0);
+			(eld->monitor_present && eld->eld_valid) ? SND_JACK_AVOUT : 0);
  unlock:
 	mutex_unlock(&per_pin->lock);
 }