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

VDR User user.vdr at gmail.com
Tue May 20 17:01:46 CEST 2014


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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