[alsa-devel] HDMI hotplug on Skylake when power well is off

[Vinod Koul]

On Thu, Jul 16, 2015 at 03:57:03PM +0200, Takashi Iwai wrote:
> > >>> Yes.  This was supposed to work with WAKEEN bits, but this didn't work
> > >>> as expected, after all.
> > 
> > But this applies only to HDMI codecs and the power well, right? Analog 
> > controllers could go into D3 and WAKEEN would wake them up? Or did we 
> > never get that working either?
> 
> Well, the analog codec wakeup never worked in my tests.  Maybe some
> hardware works, who knows.
So essentialy both for analog and hdmi this never works reliably ?
I was under the impression taht this was working okay

> > Anyhow, I went searching in the video drivers for things to match on, 
> > inspired by your thoughts about submitting information from the graphics 
> > driver to the audio driver. See new attached patch (still writing blind 
> > drafts). Let me know what you think.
> 
> Thanks, this looks promising!
> 
> > I think "connector->name" seems what the most reasonable thing to export 
> > to userspace to indicate what gfx output is related to which audio nid, 
> > and the port being what maps 1-to-1 to a nid - we'll use that for our 
> > own lookup (this lookup might differ between hardware generations).
> 
> Yeah, this mapping is the unresolved mystery.  This mythos has to be
> revealed by Intel people.
Are you talking about nid to connctor name mapping or something else?

-- 
~Vinod