2 May
2015
2 May
'15
2:20 p.m.
I discovered that I sent this message only to Len instead of to the
list. Happens to me far too often...
On Wed, 29 Apr 2015 15:16:24 -0700 (PDT)
Len Ovens <len(a)ovenwerks.net> wrote:
Right, I did not consider the case of switching a running application
over to the new interface. However, this is a limitation I could live
with. Do you know a solution for that?
It would be sufficient if the default interface was properly set on
boot or resume. It would probably not hurt if it was set whenever a usb
audio device gets plugged in. I'm not quite sure which mechanism allows
me to do that. ALSA alone? Udev?
In the very
rare occasion that I do need to use pulse, I also start
it manually. I have taken all kinds of measures to prevent pulse
from starting itself. This question is solely about alsa.
Or to put it another way, desktop audio. The tool that does what you
want is (you probably won't like this) pulseaudio. PA is the only
tool I know that can switch an application from one output/input to
another on the fly without stopping the application streaming that
audio. Learning about Pulse enough to find a way of stopping it from
playing with IF levels seems to be the solution to the problem.
Almost any other solution would require the restarting of the
application streaming audio to pick up the new device. PA can move
the stream to a new device in mid stream. It would still take some
script I think... probably run by udev, but I am not sure as I have
my system setup to never do sleep mode... In fact my swap partitions
are not big enough as they were setup when I had less memory :) PA does not always play with alsa volume levels. It
seems to depend
on the AI itself. For example the ice1712 based cards do not have
this problem. This says to me that there is probably a profile set up
for the intel HDA cards that tells PA how to set the volume levels
and changing the profile could make it so PA was no longer able to do
so.
I've seen it mess with the mixer too many times, including turning the
mic volume to max, turning the mic boost to max and nearly ruining my
speakers and my ears. And quite simply: if I set the mixer levels, I
expect them to stay that way.
Regards,
Philipp