[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 #118 from Przemysław Kopa <prymoo at gmail.com> ---
(In reply to Lukas Wunner from comment #116)
> @Przemysław Kopa:
> 
> The fix was applied by Takashi Iwai on Thursday Oct 17 with commit
> 94989e318b2f, it was merged to Linus' tree on Friday Oct 18 and will thus be
> part of v5.4-rc4 due out later today. It should appear in v5.3-stable within
> 1 or 2 weeks. You may want to double-check that the issue is gone with this
> fix.

Thanks, I can happily confirm that the issue is fixed in v5.4-rc4. :)

> There's one problem remaining, you shouldn't have to manually echo "auto" to
> the HDA's control file because we call pm_runtime_allow() on the HDA device
> in drivers/pci/quirks.c:quirk_gpu_hda() -> pci_create_device_link().
> Something must be calling pm_runtime_forbid() afterwards, perhaps this is
> triggered from user space on Arch Linux. I'm attaching a little debug patch
> which logs a stacktrace to dmesg whenever pm_runtime_allow() / _forbid() is
> called for a device. Feel free to attach dmesg output with this patch
> applied and I'll be happy to take a look at it.

I'm attaching dmesg dump - last stack trace is generated after me echoing
"auto" to HDA control file.

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