linuxaudio.org

On 07/16/2012 11:30 AM, Ivan K wrote:

quoted text
> Fernando Lopez-Lezcano  writes:

>> On 07/16/2012 09:09 AM, Charles Henry wrote:

>>> On Sun, Jul 15, 2012 at 10:59 PM, Robin Paulson   wrote:

>>>> [...]

>>>>

>>>> personally, if you're going to use this for recording/making music,

>>>> i'd recommend ripping out pulseaudio entirely and installing jack

>>>> instead.

>>>>

>>>> those applications will become redundant then.

>>>>

>>>> there are many jack-specific mixer/playback/control applications to

>>>> manipulate the sound, and it is far superior to pulseaudio, although

>>>> the latter is fine for general use: voip, listening to music, etc.

>>>

>>> Is there still a "pasuspender" (Pulse Audio suspender) command to let

>>> you run jack or alsa applications without the PA in the middle?

>>

>> Jack will automatically request the card from Pulse Audio and release it

>> when it is done, you don't need to do anything special.

>

> I still hear no sound from coming out of my computer though, so

> how do I need to configure

>

>     xfce4-mixer, alsamixergui, and/or "Envy 24 Control"?

"Envy 24 Control" will directly control your soundcard. Make sure you go

to the "Analog Volume" tab (I think that is the name) and get the output

volume up in each output channel you want to use. You do not normally

need to touch or use the internal chipset mixer.
If you want to use a Jack based application you would need to point jack

to the proper soundcard. What I usually do is to look at the output (in

a terminal) of "cat /proc/asound/cards", this will show you a list of

the cards your system recognized. In my laptop for example I see:
----

$ cat /proc/asound/cards

  0 [Intel          ]: HDA-Intel - HDA Intel

                       HDA Intel at 0xf2420000 irq 44

  1 [NVidia         ]: HDA-Intel - HDA NVidia

                       HDA NVidia at 0xcdefc000 irq 16

29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control

                       ThinkPad Console Audio Control at EC reg 0x30, fw

6MHT38WW-1.13

----
Just to test if things start you could start jack from the command line

like this:
----

jackd -R -d alsa -d hw:Intel

----
(just replace "Intel" with the name that is between '[]' in the card you

want to use)
Jack should start cleanly and just sit there waiting for clients to

connect. If that hurdle is behind you you can start qjackctl (a gui

front end) instead, change the "Interface" name in the Setup panel to

hw:Intel (or whatever is the name of your card), select "Realtime" and

start Jack.
To test you could, for example, install Hydrogen, start it and use one

of its demo patterns to test sound. You might need to go to the

preferences and make sure it is using Jack as the backend. Also, make

sure that its outputs are connected to the Jack output ports in

qjackctl's "Connect" pane... Press play and you should get sound out of

your card (if the analog volumes are up).
If you want to test with aplay and output directly to ALSA then you also

need to tell aplay which card to use. A basic command in my case would

be "aplay --device=hw:Intel soundfile". If your soundfile is not exactly

of the right type aplay may complain, and you can usually make it happy

again by saying "aplay --device=plughw:Intel soundfile" instead, which

will automatically convert formats...
If you want to, say, play sounds from your internet browser (and from

most system programs) you will deal with Pulse Audio. Again, like

before, you will need to tell it which card to use. Depending on which

window manager you use you might have a small speaker icon somewhere

which you can use to left click and set the overall volume. Usually if

you right click you can start the "Sound Preferences" panel which will

let you set which card is used for input and output. On Fedora 17 you

can go to the System Preferences dialog and select "Sound" (if I

remember correctly) and start the same Pulse Audio Manager.
Best of lucks!

-- Fernando

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