[mythtv-users] 5.1 surround sound and two mixer controls

Jean-Yves Avenard jyavenard at gmail.com
Thu Dec 2 22:50:55 UTC 2010


Hi

On 3 December 2010 08:51, Achim Hofmann <news at achim-hofmann.com> wrote:
> In my MythBox there's a VIA Technologies, Inc. VT8233/A/8235/8237 AC97
> Audio Controller (rev 60) and the sound configuration within my MythTV
> frontend looks like this:
>
>
> Setup -> General -> Audio System
>
> Audio output device: ALSA:surround51
> Speakers configuraion: 5.1
>
>
> Setup -> General -> Audio Mixer
>
> Use Internal Volume Controls: Yes
> Mixer Device: ALSA:default
> Mixer Controls: Master
>
>
> alsamixer shows me two Master controls: "Master" and "Master Surround".
>
> Using the above configuration, 5.1 sound works fine but I've a problem
> with volume control:
>
> Using alsamixer from a remote machine over ssh I discovered that...
>
> ..."Master" / "PCM" controls front left and front right speakers
> ..."Master Surround" controls center speaker, LFE, sub left and sub
> right speakers.

Unfortunately, myth only supports PCM and Master ; it's a pretty
outdated mixer code something that will be done in 0.25

At this stage, there's no easy way to get around your problem other
than using an external mixer application and turning off myth one


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