Audio out on DisplayPort but not HDMI, on AMD Ryzen APU/Vega

[Takashi Iwai]

On Fri, 09 Jul 2021 16:40:18 +0200,
Damjan Georgievski wrote:
> 
> > > Should this hardware be supported with the
> > > sound/soc/amd/renoir/rn-pci-acp3x.c driver (instead of snd_hda_intel)?
> > > … since it is a Renoir desktop APU.
> > >
> > > > Please give alsa-info.sh output for more detailed analysis.
> > >
> > > http://alsa-project.org/db/?f=00b31f3f0e6c58b56c73f98aec7c6b5ccaff700e
> >
> > The codec proc output there shows that only one pin is enabled for
> > HDMI/DP output, and that's the reason why the driver created only one
> > stream.  It's basically a BIOS setup.
> >
> > The patch below should enable all pins forcibly and this should give
> > more streams.  Give it a try.
> >
> >
> > Takashi
> >
> > --- a/sound/pci/hda/patch_hdmi.c
> > +++ b/sound/pci/hda/patch_hdmi.c
> > @@ -1940,6 +1940,7 @@ static int hdmi_add_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
> >  static const struct snd_pci_quirk force_connect_list[] = {
> >         SND_PCI_QUIRK(0x103c, 0x870f, "HP", 1),
> >         SND_PCI_QUIRK(0x103c, 0x871a, "HP", 1),
> > +       SND_PCI_QUIRK(0x1462, 0xec94, "MS-7C94", 1),
> >         {}
> >  };
> >
> 
> This somewhat improved the situation. I get multiple HDMI devices on
> the card now, and the
> default seems to be the actual HDMI port (as opposed to the DisplayPort).
> 
> But I can't manually control where the audio goes, and at one point (I
> think when the TV was off),
> it automatically switched to the DisplayPort.

The connection is indeed managed dynamically, hence you cannot expect
which port is for what exactly.  The actual connection should be
checked by EDID (or ELD).

So, does the sound output from DP also work as expected, as well as
HDMI?


Takashi