[PlanetCCRMA] Pd + PulseAudio?

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Wed Mar 24 13:27:17 PDT 2010

On Wed, 2010-03-24 at 11:49 -0700, Niels Mayer wrote:
> On Tue, Mar 23, 2010 at 8:26 PM, Peter Kirn
> <peter at createdigitalmedia.net> wrote:
>         Looking at AlsaMixer as you suggest, I definitely see the HDA
>         Intel
>         card. Master and PCM have volume levels; Headphone and Speaker
>         show up
>         but do not have mixer values.
> ...
>         "control open "hw:intel" (No such device)
>         Cannot initialize driver"
> Hunches: 
> Something is unexpectedly grabbing your hw:intel controls.

Nope. That was just a typo ("intel" instead of "Intel"), there's nothing
magical going on here. 

> Consider that X/Gdm launch pulseaudio, so you can have those cute
> noises when you mistype your password; it will therefore grab the
> hw:intel controls. By totally removing pulseaudio, this can't happen,
> ever.

If you launch jack and use jack you won't have any problems either
(provided you use a jack that negotiates with pulseaudio). If you are
using jack aware programs I don't see any reason to not use jack. In
that case pulseaudio will relinquish and not use the soundcard that jack
is acquiring. Period. 

If you deliberately want to send non-jack stuff to jack, that only can
be accessed through pulseaudio streams you can load the jack sink
pulseaudio plugin and direct your pulseaudio streams there. I almost did
that by default in my jackd wrapper script for fc11 but I ended up
deciding the user should control that explicitly (when that option was
enabled I was able to start Jack and existing pulse audio streams would
keep playing through jack after it finished starting up!). 

-- Fernando

> Consider also that these intel cards often include a semi-shared HDMI
> audio portion e.g.
> ##  1 [SB             ]: HDA-Intel - HDA ATI SB
> ##                       HDA ATI SB at 0xfb7f4000 irq 16
> ##  2 [HDMI           ]: HDA-Intel - HDA ATI HDMI
> ##                       HDA ATI HDMI at 0xfb9fc000 irq 19
> Perhaps also consider disabling the HDMI portion to prevent
> interference from that (as well as not loading extra drivers that
> you're not using).
> (from /etc/modprobe/*.conf: )
> alias snd-card-1 snd-hda-intel
> options snd-hda-intel index=1,2 enable=1,0
> As a half-step towards preventing problems, you can also even w/ pulse
> running, disable all system sounds and all error warning sounds. That
> causes a whole class of sound system lockups in and of itself.
> However, once you've gone that far, you might as well go all the way
> and follow my original
> suggestion: http://old.nabble.com/uninstall-pulseaudio-to-increase-audio-app-stability-across-updates-%28was-Re%3A-yum-update%29-tp27759501p27759501.html
> -- Niels
> http://nielsmayer.com
> _______________________________________________

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