[Bug 75985] [NVC1] HDMI audio device only visible after rescan - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

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: Tue, 06 Mar 2018 19:57:28 +0000	[thread overview]
Message-ID: <bug-75985-8800-B31cfzI4of@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 #56 from Lukas Wunner <lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org> ---
(In reply to Ilia Mirkin from comment #53)
> (In reply to Lukas Wunner from comment #52)
> > Ilia, do you have definitive knowledge of GPUs which
> > a) have a different class than PCI_CLASS_DISPLAY_VGA and
> > b) have working DP/HDMI outputs and
> > c) have an integrated HDA controller?
> > 
> > I'm asking because get_bound_vga() in sound/pci/hda/hda_intel.c specifically
> > matches against PCI_CLASS_DISPLAY_VGA only. In other words, if a GPU with
> > the three above-listed properties exists and is built into a hybrid graphics
> > laptop, it is currently not registered with vga_switcheroo, which would be
> > wrong.
> 
> I can say with some certainty that there are laptops running around, esp
> GM107's, whose pci class is 3D, and that have attached DP/HDMI outputs.
> 
> I don't think the users in question ever asked about audio, so I don't know
> about the last bit. However I can't imagine that it wouldn't be there (esp
> once all the proper enablement is done).

In the meantime I've done extensive googling for dmesg output of a laptop that
satisfies all three conditions listed above, but I come back empty-handed. I
did find machines with a PCI_CLASS_DISPLAY_3D Nvidia card and an HDA device on
function 1, but those weren't laptops. So it looks to me like we're good right
now but we'll definitely need to amend hda_intel.c if we expose the HDA device
on all modern cards.

> Is hda_intel only for intel?

No, that file contains the driver for all PCI HDA devices, its name is a
historic artifact.

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