[Nouveau] [Bug 75985] [NVC1] HDMI audio device only visible after rescan

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75985

--- Comment #74 from Eugene Medvedev <rn3aoh.g at gmail.com> ---
(In reply to Maik Freudenberg from comment #27)
> Created attachment 136418 [details]
> Kernel module to toggle audio function

I have a somewhat strange variation on the bug when using your kernel module
workaround.

MSI GE63 Raider 8RF looks like this when everything's working:

00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM
Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core
Processor PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
00:12.0 Signal processing controller: Intel Corporation Cannon Lake PCH Thermal
Controller (rev 10)
00:14.0 USB controller: Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host
Controller (rev 10)
00:14.2 RAM memory: Intel Corporation Cannon Lake PCH Shared SRAM (rev 10)
00:14.3 Network controller: Intel Corporation Wireless-AC 9560 [Jefferson Peak]
(rev 10)
00:16.0 Communication controller: Intel Corporation Cannon Lake PCH HECI
Controller (rev 10)
00:17.0 SATA controller: Intel Corporation Device a353 (rev 10)
00:1d.0 PCI bridge: Intel Corporation Cannon Lake PCH PCI Express Root Port 9
(rev f0)
00:1d.6 PCI bridge: Intel Corporation Device a336 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device a30d (rev 10)
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
00:1f.4 SMBus: Intel Corporation Cannon Lake PCH SMBus Controller (rev 10)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Lake PCH SPI
Controller (rev 10)
01:00.0 VGA compatible controller: NVIDIA Corporation GP104M [GeForce GTX 1070
Mobile] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller
(rev a1)
02:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc.
Device 5008 (rev 01)
03:00.0 Ethernet controller: Qualcomm Atheros Killer E2500 Gigabit Ethernet
Controller (rev 10)

What's strange is that upon cold boot -- using the proprietary driver -- the
audio subdevice is missing entirely -- even from "lspci -H1" and can't be
enabled:

[    3.214369] nvhda: version 0.01
[    3.214373] nvhda: Found nv VGA device 0000:01:00.0
[    3.214377] nvhda: enabling audio
[    3.214378] nvhda: Not multifunction, no audio
[    3.214380] nvhda: Succesfully loaded. Audio 0000:01:00.0 is off

Unloading and reloading the module after the boot has completed makes no
difference, it doesn't work. Upon suspending and resuming once, however, the
device is there on "lspci -H1", and the module can enable it. I ended up
setting the module up to unload on suspend and load on resume, so that I can
just do a suspend/resume when I need to use HDMI output, which isn't that
often.

I can supply further data and experiment a bit if needed, but my understanding
of this area of hardware is essentially nil.

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