From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 75985] [NVC1] HDMI audio device only visible after rescan
Date: Mon, 24 Jun 2019 09:56:03 +0000 [thread overview]
Message-ID: <bug-75985-8800-zor389w3TL@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-75985-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=75985
--- Comment #79 from Daniel Drake <dan-LrsmPHowOvpd3aXB8m+yKQ@public.gmane.org> ---
Thanks, you're right, the value changes based on HDMI connector status.
So for this platform, \_SB.PCI0.PEG0 has a PG00 PowerResource that will set the
magic bit in _ON, and likewise \_SB.PCI0.PEG0.PEGP has a _PS0 that will set the
bit too.
This all sounds like it should set the appropriate state at boot time, but I
wouldn't expect these methods to be called when the HDMI connector is
hotplugged. And I can't see any linkage to anything more dynamic like _DSM.
Indeed booting Linux with HDMI already connected, the HDMI audio PCI device
appears. Same on Windows, testing without the nvidia driver installed.
I used the Clover UEFI bootloader to boot windows with a custom DSDT, modified
the GGIV() function to always return zero (disconnected) for this GPIO. Then
booting Windows with HDMI connected, the PCI device no longer appears.
Then I installed the Nvidia windows driver. Connecting HDMI either at boot or
later, the HDMI audio device appears on the PCI bus.
Conclusion: The nvidia windows driver directly controls the magic bit here,
triggering a PCI bus rescan too, without relying on ACPI.
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Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 15:56 [Bug 75985] New: HDMI audio device only visible after rescan bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
[not found] ` <bug-75985-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>
2014-03-10 16:00 ` [Bug 75985] [NVC1] " bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-03-10 16:15 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-03-10 23:14 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-03-10 23:14 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-09-15 23:52 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2014-09-16 6:33 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2016-07-16 17:20 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2016-11-05 22:30 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
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