[pulseaudio-discuss] [SOLVED] Re: No sound output after upgrade

[Lennart Poettering]

On Sun, 24.01.10 22:03, David Björkevik (david at bjorkevik.se) wrote:

> --- a	2010-01-24 20:53:23.288259727 +0100
> +++ b	2010-01-24 20:53:15.762260385 +0100
> @@ -147,20 +147,20 @@
>  Simple mixer control 'Multi Track Peak',0
>    Capabilities: volume penum
>    Playback channels: Front Left - Front Right - Rear Left - Rear
> Right - Front Center - Woofer - Side Left - Side Right - Rear Center
> - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
>    Capture channels: Front Left - Front Right - Rear Left - Rear
> Right - Front Center - Woofer - Side Left - Side Right - Rear Center
> - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
>    Limits: 0 - 255
> -  Front Left: 39 [15%]
> -  Front Right: 28 [11%]
> +  Front Left: 0 [0%]
> +  Front Right: 0 [0%]
>    Rear Left: 0 [0%]
>    Rear Right: 0 [0%]
>    Front Center: 0 [0%]
>    Woofer: 0 [0%]
>    Side Left: 0 [0%]
>    Side Right: 0 [0%]
> -  Rear Center: 142 [56%]
> -  ?: 152 [60%]
> +  Rear Center: 119 [47%]
> +  ?: 110 [43%]
>    ?: 0 [0%]
>    ?: 0 [0%]
>    ?: 0 [0%]
>    ?: 0 [0%]
>    ?: 0 [0%]
> 
> Apparently, PulseAudio mutes the "Multi Track Peak" control. I did
> not catch this earlier, since that channel appear "frozen" in the
> alsamixer UI.

Umpf. We don't touch that control. In fact I have never heard of it at
all.

What is very interesting is that this mixer control appears to
properly do multichannel audio. This is an exception, and even for
multichannel cards ALSA drivers tend to implement multiple seperate
stereo sliders for front, rear, surround and so on.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4