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Old 08-29-2004, 02:12 PM   #1
Techweenie1
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Registered: Feb 2003
Location: Hinsdale/Chicago, IL, USA
Distribution: Slackware 10 (2.6.8.1)
Posts: 43

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Automuting sound from TV Tuner?


On my linux box I have a Sound Blaster AWE64 ISA Card and a 3dfx Desktop TV/FM PCI Card (also goes by STB Desktop TV/FM). The TV/FM card is based on the bt878 chipset with a Phillips NTSC Tuner. Anyway I have the audio from the TV tuner going into the Auxiliary port (internal) on my AWE and I have the CD out going to the CD-IN (internal) on the AWE. For sound I am using the ALSA version 1.0.5a with OSS Compatibility modules loaded.

When I launch the Gnome Mixer (gnome-volume-control) I have two tabs one saying CTL1745 [Audio Mixer (OSS)] and another that says Sound Blaster 16 [Alsa Mixer]. They both control my AWE Card. At startup as soon as ALSA loads my OSS Compatibility modules I get this loud deafening sound of static coming from my speaker.

Next I try using my Alsa Mixer to adjust the sound, of course no AUX control is present so I try one by one, and to my surprise it turns out that my AUX is controlled by the CD Volume. But not only that the CD Volume also controls the CD-IN volume, making it hard to listen to an audio cd if I wanted to without hearing either static or a properly tuned channel. On the ALSA Mixer checking the Mute box does nothing under the CD volume control...while if I go to the OSS Mixer and click the mute box under the CD Mixer it actually mutes!

So I push mute, effectively muting my CD-IN and AUX. So I fire up a tv app to make sure my tuner is working right. I tried both xawtv and tvtime, both load the tuner fine, with no sound, unless I actually adjust the volume from the mixer or from tvtime's or xawtv's volume control. After quiting tvtime or xawtv with the volume from my tuner unmuted it stays unmuted. So I have to go to the OSS mixer in gnome again and mute it!

Anyway this is very frustrating, how can I have it so that 1) My Aux and my CD volumes don't correspond to the same volume control in my mixer, 2) how can I get the ALSA Mute button working on the the volume controlling my AUX , and 3) How do I setup my tv/radio audio so that it mutes when I am not using a tv or radio application and unmute when I am?

Thank you in advance
 
Old 08-29-2004, 02:59 PM   #2
Techweenie1
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Registered: Feb 2003
Location: Hinsdale/Chicago, IL, USA
Distribution: Slackware 10 (2.6.8.1)
Posts: 43

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Rep: Reputation: 15
can a mod please delete this thread (moved to Hardware)

Last edited by Techweenie1; 08-29-2004 at 04:34 PM.
 
  


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