Issue report: HDMI audio problem with kernel 5.6.6-300 and Nvidia

[Naoaki Ueda]

Hi,
Thank you for developing the awesome products.

I notice my machine doesn't output any sounds from the HDMI port with
kernel-5.6.6-300 and Nvidia.
I have tried booting my machine with kernel-5.3.7-301.fc31.x86_64, it
works fine.
So I'm reporting those here referring
https://bugzilla.redhat.com/show_bug.cgi?id=1784839.

Following are the part of the outputs from `lspci -v -k` on my machine:

```
05:00.0 VGA compatible controller: NVIDIA Corporation GP106 [GeForce
GTX 1060 3GB] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: NVIDIA Corporation Device 11c2
        Physical Slot: 2
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at ee000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at e0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at c000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Legacy Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [250] Latency Tolerance Reporting
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [420] Advanced Error Reporting
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1
Len=024 <?>
        Capabilities: [900] Secondary PCI Express
        Kernel driver in use: nouveau
        Kernel modules: nouveau

05:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio
Controller (rev a1)
        Subsystem: NVIDIA Corporation Device 11c2
        Physical Slot: 2
        Flags: bus master, fast devsel, latency 0, IRQ 50
        Memory at ef080000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel
```

Best regards,

Nao Ueda
Japan