Re: Alder Lake MiniPC - sound via HDMI does not work

On Mon, 3 Feb 2025 13:50:44 -0500
Alexander Motin <mavbsd@gmail.com> wrote:

> On 03.02.2025 10:08, Milan Obuch wrote:
> > Something from boot log (dmesg):
> > 
> > hdac0: <Intel Alder Lake-N HDA Controller> mem
> > 0x6001130000-0x6001133fff,0x6001000000-0x60010fffff at device 31.3
> > on pci0 hdac0: PCI card vendor: 0x0301, device: 0x02f3 hdac0: HDA
> > Driver Revision: 20120126_0002 hdac0: Config options: on=0x00000000
> > off=0x00000000 hdac0: Caps: OSS 9, ISS 7, BSS 0, NSDO 1, 64bit,
> > CORB 256, RIRB 256 hdac0: attempting to allocate 1 MSI vectors (1
> > supported) msi: routing MSI IRQ 132 to local APIC 6 vector 50
> > hdac0: using IRQ 132 for MSI  
> 
> So the HDA controller is detected.  But if there is no `hdacc`
> line(s) following it, then either there is no CODECs connected to the
> HDA bus, or something wrong with the detection, which I haven't seen
> reported for a very long time.  I do see some cases when HDMI codec
> falls of the HDA bus, possibly during some activity from the video
> driver, causing timeouts though, and this might in theory be related,
> but I've never had clues how to debug it.
> 

Well, this box ships with Windows installer, so for test I swapped disc
and let installer do its job. Touching the subject, sound is possible
to send to monitor via HDMI.

So hardware is definitely capable of using HDMI for audio, now the
question is, how can we extract relevant pieces of information and make
it work in FreeBSD.

Regards,
Milan