On Sat, 01 Sep 2018 18:28:34 +0200,
Andreas Müller wrote:
>
> Hi,
>
> This is my first post here and guess what I am looking for support :)
>
> Up to now I used audioinjector and hifiberry on RaspberryPi and that
> worked without issues (from alsa point of view).
>
> Now I would like to select vc4hdmi on alsamixer but that complains for
> missing controls. I think vc4hdmi does not support hard volume setting
> - like some other devices.
>
> So I read here and there and found softvol. To test I modified
> vc4-hdmi.conf shipped with alsal-iib from:
>
> # default with dmix
> vc4-hdmi.pcm.default {
> @args [ CARD ]
> @args.CARD {
> type string
> }
> type asym
> playback.pcm {
> type plug
> slave.pcm {
> @func concat
> strings [ "dmix:" $CARD ]
> }
> }
> }
>
> to (stolen from PC-Speaker.conf)
>
> # default with dmix
> vc4-hdmi.pcm.default {
> @args [ CARD ]
> @args.CARD {
> type string
> }
> type asym
> playback.pcm {
> type plug
> slave.pcm {
> type softvol
> control {
> name "Master Playback Volume"
> card $CARD
> }
> slave.pcm {
> @func concat
> strings [ "dmix:" $CARD ]
> }
> }
> }
> }
>
> after reboot nothing changes! I build my images with
> Openembedded/Yocto and from my experience it is possible that there is
> some misconfiguration / path issue causes problems. I know the card
> works with the help of pulseaudio.
Hm, this should work. Maybe vc4-hdmi.conf isn't used at all for your
device? You can try an error injection (just put some bogus line in
that config file) to see whether it's evaluated or not.
> So now my questions:
> * Would you expect that my modification of vc4-hdmi.conf adds softvol
> control to vc4hdmi?
> * If yes: The only information I have currently: It does not work as
> expected. So where can I ask alsa for some feedback what went wrong
> (log-files/dmesg/journal...)?
$LIBASOUND_DEBUG variable can be set to show more errors, but it
doesn't help always.
Takashi
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