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: Fri, 22 Dec 2017 19:15:41 +0000 [thread overview]
Message-ID: <bug-75985-8800-UsizgL5Ord@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 #22 from Daniel Drake <dan-LrsmPHowOvpd3aXB8m+yKQ@public.gmane.org> ---
Created attachment 136369
--> https://bugs.freedesktop.org/attachment.cgi?id=136369&action=edit
GP104: enable HDMI audio device function
On Asus GL502VS I investigated why the gfx device must be removed before rescan
in the above workarounds.
The reason is that when Linux first probes the device (before you attempt the
workaround), pci_setup_device() notes that the device is not multifunction
capable. This causes pci_scan_slot() to not bother scanning the non-zero
functions (per the behaviour inside next_fn()).
I checked and I found that when the 0x488 magic bit is not set, the gfx device
advertises as non-multifunction. After the bit is set, the device advertises as
multi-function. So, after setting the magic bit, removing the device will cause
Linux to re-probe it during the next rescan, taking note at that point that it
is a multi-function device, and proceeding to scan the functions, finding the
audio device at function 1.
Based on that I have a first attempt at a fix. It's not working though, audio
output is silent (but I did have it working with the previous workarounds).
I'll look closer next week.
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next prev parent reply other threads:[~2017-12-22 19:15 UTC|newest]
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
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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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2017-09-26 10:04 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2017-09-26 22:50 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2017-09-28 12:33 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
2017-09-30 2:45 ` bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ
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