[alsa-devel] Force an update of the ELD info?

Takashi Iwai tiwai at suse.de
Tue May 20 18:12:59 CEST 2014

At Tue, 20 May 2014 08:01:46 -0700,
VDR User wrote:
> Nobody?

It's rather about question in the graphics driver side, and this
follows the question how to communicate between audio and video
drivers, which we're discussing now in another thread.

The actual fetch of ELD information is done in the graphics driver, so
you have to trigger there.  It can't be finished in the audio side


> On Tue, May 13, 2014 at 7:56 PM, VDR User <user.vdr at gmail.com> wrote:
> > Hi. I was wondering if it's possible to force alsa/drivers to update
> > the ELD info yet? If not, is this something that can be added? Reason
> > being, htpc users may or may not have their receiver/surround sound on
> > at any given time. The ELD info can be used to determine this, and
> > thus audio playback can be appropriately set for surround/no-surround
> > at any given time. As it is now, to even use surround, the receiver
> > must be turned on before the system is booted. That may not always be
> > convenient. Also, leaving a receiver on 24/7 is a waste of power,
> > generates heat, and puts unnecessary wear & tear on equipment that's
> > not being used at the time.
> >
> > I have been told one way to force an ELD update is to completely
> > unload alsa/drivers, and reload them. However, that's very
> > inconvenient as it requires plugging in a keyboard, or ssh'ing into
> > the box, unloading everything, toggling the receivers power state,
> > then reloading everything. That's a pretty disruptive process which,
> > if can be avoided, should be.
> >
> > Also, could someone with the proper knowledge clarify is this is
> > something that alsa needs to support, the sound drivers need to
> > support, and/or the video drivers need to support? I've heard very
> > different answers and would like some clear info on this if anyone has
> > any to offer.
> >
> > In case anyone is wondering, I have multiple linux htpcs connected via
> > hdmi to receivers, that are then connected to tvs. These boxes have
> > nothing more than an IR receiver connected to them for navigating an
> > OSD. All of the boxes are using Nvidia video cards with vdpau
> > decoding, and audio-over-hdmi with the snd_hda_intel.
> >
> > Many thanks for any input!
> > -DK
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