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[SOLVED] cx88: white noise with audio cable; no sound with cx88-alsa




On May 23 13:17 +0200, Steve S  wrote:
> Hi all.
> 
> This is my first post, so please be gentle :)
> 
> I have a WinTV PCI card with a cx88 chip.
> 
> --------------------------------------------
> 00:0f.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder (rev 03)
> 00:0f.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 03)
> 
> --------------------------------------------
> $ cat /proc/asound/cards
>  0 [V8235          ]: VIA8233 - VIA 8235
>                       VIA 8235 with ALC650E at 0xe000, irq 19
>  1 [CX8811         ]: CX88x - Conexant CX8811
>                       Conexant CX8811 at 0xd2000000
> 
> --------------------------------------------
> /etc/asound.names:
> 
> ctl {
> 	alsactl1 {
> 		name hw:0
> 		comment 'Physical Device - VIA 8235 with ALC650E at 0xe000, irq 19'
> 	}
> 	alsactl2 {
> 		name hw:1
> 		comment 'Physical Device - Conexant CX8811 at 0xd2000000'
> 	}
> }
> [...]
> 
> --------------------------------------------
> 

[...]

>
> 1) Right now, I'm capturing the sound using the analog audio cable that's
> plugged into my onboard soundcard line-in (the VIA chip). At boot, I hear white
> (static) noise coming from the line out of the TV card. If I start my TV app
> (tvtime), the noise is replaced by the normal TV sound. When I close the TV
> app, the noise is gone.

Solution: Mute the Line In at shutdown and reboot.

At boot, the TV card sound gets activated, even if there is no need to (related
to the post by Daniel Gimpelevich: "[PATCH] Implement proper cx88
deactivation"?).  This produces white noise at the Line In. At shutdown or
reboot, /etc/init.d/alsa (/etc/rc{0,6}.d/K<NN>alsa) stores the current mixer
status, and here esspecially the Line In volume. I had to add a script 
/etc/init.d/foo (/etc/rc{0,6}.d/K<MM>foo), which mutes the Line In (`amixer set
Line mute`) *before* the ALSA K scripts are called. So, at boot, the card audio is
still active, but Line In is silent. Yeah!

best,
steve

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