[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 #120 from Lukas Wunner <lukas at wunner.de> ---
(In reply to Przemysław Kopa from comment #118)
> (In reply to Lukas Wunner from comment #116)
> > 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.

Okay the culprit is a tool called "tlp" which disables runtime PM on the HDA
controller via sysfs:

[    8.472292] snd_hda_intel 0000:01:00.1: pm_runtime_forbid
[    8.474196] CPU: 0 PID: 494 Comm: tlp Not tainted 5.4.0-rc4-mainline #1
[    8.477943] Call Trace:
[    8.477952]  dump_stack+0x5c/0x80
[    8.477957]  pm_runtime_forbid.cold+0x1b/0x38
[    8.477960]  control_store+0x78/0x80
[    8.477964]  kernfs_fop_write+0x10e/0x190

I'm not familiar with "tlp" at all but according to this page...

https://linrunner.de/en/tlp/docs/tlp-configuration.html#audio

... I suspect you may have set "SOUND_POWER_SAVE_CONTROLLER=N" or
"SOUND_POWER_SAVE_ON_AC=0" in /etc/default/tlp. If so, try if changing those
settings fixes the issue.

Some more info on "tlp" can be found here:

https://wiki.archlinux.org/index.php/TLP

Hope that helps!

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