29 Apr
2010
29 Apr
'10
10:31 p.m.
Hello all,
I got a new computer recently, with onboard audio (ATI Technologies
Inc SBx00 Azalia (Intel HDA) according to ALSA). I discovered that if
there's no microphone connected, jack (jackdmp 1.9.5) doesn't run and
outputs a continuous stream of "alsa_driver_xrun_recovery
JackAudioDriver::ProcessAsync: read error, skip cycle". As soon as I
connect a mic, it works normally.
When starting it with the -P option (playback only), mic presence
doesn't affect jack operation, but of course there are no capture ports
available.
It doesn't make much of a difference for me right now, but just for
curiosity's sake, I'm wondering if it's possible to start jack without a
mic and have capture ports appear automatically when one is connected.
Thanks,
Alexandros
29 Apr
29 Apr
10:43 p.m.
On Thu, Apr 29, 2010 at 4:31 PM, Alexandros Diamantidis <adia(a)hellug.gr>wrote;wrote:
Hello all,
I got a new computer recently, with onboard audio (ATI Technologies
Inc SBx00 Azalia (Intel HDA) according to ALSA). I discovered that if
there's no microphone connected, jack (jackdmp 1.9.5) doesn't run and
outputs a continuous stream of "alsa_driver_xrun_recovery
JackAudioDriver::ProcessAsync: read error, skip cycle". As soon as I
connect a mic, it works normally.
When starting it with the -P option (playback only), mic presence
doesn't affect jack operation, but of course there are no capture ports
available.
It doesn't make much of a difference for me right now, but just for
curiosity's sake, I'm wondering if it's possible to start jack without a
mic and have capture ports appear automatically when one is connected.
you appear to have an HDA chipset with "jack detection" (it detects when a
jack is inserted). you can't do what you asked about, but you can get close
to it.
use a h/w mixer control application (e.g. the ugly and terminal-based
but-so-far-unmatched alsamixer) to set the capture source of the device back
to, perhaps, "line in". then later, switch it to the "mic". JACK pays
(almost) no attention to the state/settings of the h/w mixer, so it has no
clue what you're recording from or whether or not a mic is plugged in.
--p
11:46 p.m.
* Paul Davis [2010-04-29 16:43]:
use a h/w mixer control application (e.g. the ugly and
terminal-based
but-so-far-unmatched alsamixer) to set the capture source of the device back
to, perhaps, "line in". then later, switch it to the "mic".
Thanks, that worked. Strange thing is I actually had to set the capture
source first to "Stereo Mixer" and then to "Mic" - the other sources
(CD, Line, Front Mic, Stereo Mixer, or setting "Front Mic" and then
"Mic") all exhibited the same behaviour, but setting it to "Stereo
Mixer" and then to "Mic" and leaving it there allowed starting jack with
nothing connected to any jack. I wonder why the source selected *before*
switching to "Mic" matters!
Also, it seems there's no need to connect an actual mic - connecting just
a 1/4" to 3.5mm adapter works just as well. I think I'll just leave it
plugged in.
Regards,
Alexandros
30 Apr
30 Apr
12:53 a.m.
On Thu, Apr 29, 2010 at 5:46 PM, Alexandros Diamantidis <adia(a)hellug.gr>wrote;wrote:
* Paul Davis [2010-04-29 16:43]:
the wonders of the world of Intel HDA ... if you care about recording music,
you'll get something else when you can.
use a h/w mixer control application (e.g. the
ugly and terminal-based
but-so-far-unmatched alsamixer) to set the capture source of the device
back
to, perhaps, "line in". then later,
switch it to the "mic".
Thanks, that worked. Strange thing is I actually had to set the capture
source first to "Stereo Mixer" and then to "Mic" - the other sources
(CD, Line, Front Mic, Stereo Mixer, or setting "Front Mic" and then
"Mic") all exhibited the same behaviour, but setting it to "Stereo
Mixer" and then to "Mic" and leaving it there allowed starting jack with
nothing connected to any jack. I wonder why the source selected *before*
switching to "Mic" matters!
Also, it seems there's no need to connect an
actual mic - connecting just
a 1/4" to 3.5mm adapter works just as well. I think I'll just leave it
plugged in.
correct. Jack sensing is a purely mechanical thing. there's no complex
"detection" going on.
--p
5323
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5323
days old
linux-audio-user@lists.linuxaudio.org
3 comments
2 participants
participants (2)
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Alexandros Diamantidis -
Paul Davis