30 Sep
2004
30 Sep
'04
2:06 a.m.
This is something that has bugged me ever since I built my Linux DAW.
When I boot up, when I start jack, when I open a web page with
Flash, when I get a licq message -- anything that uses my audio
driver, I hear a fairly loud low-end pop.
Is this common? Is it a known issue I can fix? I figure it's a
problem somewhere in the following (backwards) chain:
Delta1010LT hardware (SPDIF out) -> Delta1010 alsa driver -> alsa
library -> jack.
I suspect it's not jack since it happens with other audio output as
well. I don't remember, but I don't think it was happening when I
was using the analog outs. Of course I can check that pretty quickly
when I get my Linux box hooked back up tomorrow.
Thanks,
Greg
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30 Sep
30 Sep
1:56 p.m.
On Wed, 2004-09-29 at 20:49, Greg Reddin wrote:
This is something that has bugged me ever since I
built my Linux DAW.
When I boot up, when I start jack, when I open a web page with
Flash, when I get a licq message -- anything that uses my audio
driver, I hear a fairly loud low-end pop.
Is this common? Is it a known issue I can fix? I figure it's a
problem somewhere in the following (backwards) chain:
Delta1010LT hardware (SPDIF out) -> Delta1010 alsa driver -> alsa
library -> jack.
Greg,
I cringed when I read this post. I had the same sort of problem when
I was attempting to use the RME HDSP 9652 under Linux. I was never
solved in my case and was enough for me to give up on Alsa ad Linux for
a good while. Since the HDSP line has such good support tools, hdspconf
and hdspmixer, I was able to trace a lot of stuff that you may not be
able to with your tools as I don't know what you have available.
In my case, which is not shown on your diagram, I was using an
external D/A, an Alesis AI-3. The free-running default frequency of that
unit is 48KHz. All of my work with Alsa (and Pro Tools) is at 44.1KHz.
Using hdspconf I could see that when these pops were happening the
frequency that the card was trying to work at was changing. As I'd load
an app, like Mozilla, the card's frequency would jump to strange values,
like 32KHz, and it was this frequency change that caused the pops, or so
I think. No other user of the HDSP 9652 seemed to report similar
problems so people would tell me that I had a defective card, but the
machien was dual boot and the frequency changes did not happen under
Windows and neither did the pops.
Eventually I gave up, moved the card to a different machine and
settled for running Linux using an AP2496. NIce card, but not an HDSP
9652.
I don't know if this info will help you get tot he bottom of your
problem. Most likely your cause is completely different but I thought
I'd bring the idea of your external equiment and it's interaction across
the s/pdif bus as a possible cause.
Good luck,
Mark
7:31 p.m.
On Thu, 2004-09-30 at 11:39, Mark Knecht wrote:
On Wed, 2004-09-29 at 20:49, Greg Reddin wrote:
Did you file an ALSA bug report? We are not psychic.
Lee
This is something that has bugged me ever since I
built my Linux DAW.
When I boot up, when I start jack, when I open a web page with
Flash, when I get a licq message -- anything that uses my audio
driver, I hear a fairly loud low-end pop.
Is this common? Is it a known issue I can fix? I figure it's a
problem somewhere in the following (backwards) chain:
Delta1010LT hardware (SPDIF out) -> Delta1010 alsa driver -> alsa
library -> jack.
Greg,
I cringed when I read this post. I had the same sort of problem when
I was attempting to use the RME HDSP 9652 under Linux. I was never
solved in my case and was enough for me to give up on Alsa ad Linux for
a good while. Since the HDSP line has such good support tools, hdspconf
and hdspmixer, I was able to trace a lot of stuff that you may not be
able to with your tools as I don't know what you have available.
1 Oct
1 Oct
12:09 a.m.
On Thu, 2004-09-30 at 14:14, Lee Revell wrote:
On Thu, 2004-09-30 at 11:39, Mark Knecht wrote:
Not sure if a bug report was filed or not. I just went and looked and
found the final bug report I filed on the HDSP 9652 before I yanked it
from my Linux box. It was bug #21. These click and pop problems were
actually much earlier, so possibly that was before the bug system was
put in place. I do remember that I, and others, were asking for a bug
reporting system to be put in place and it eventually was.
In response to the problems I and others were having with the HDSP 9652
I gave Thomas Charbonnel log in rights, as well as root password, and he
was doing development and debug on my machine at that time. He was the
main developer on the HDSP drivers at that time but actually didn't have
the HDSP 9652 to work with directly. He made changes looking at this and
other problems. I viewed the output of hdspconf and hdspmixer to see the
resutls and report back. It was a very intereactive process that
produced some good results - hdspmixer working far better and more
compatibly with the RME versions.
Fially, as I stated earlier, I think this problem was specific to the
use of the AI-3 since it ran at 48K. This may or may not be true, but it
was my thought at the time.
I did find a few notes in Google. Read them if you're interested.
http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg10338.html
http://lists.tartarus.org/pipermail/alsaplayer-devel/2003-December/001626.h…
Cheers,
Mark
On Wed, 2004-09-29 at 20:49, Greg Reddin wrote:
Did you file an ALSA bug report? We are not psychic.
Lee
This is something that has bugged me ever since I
built my Linux DAW.
When I boot up, when I start jack, when I open a web page with
Flash, when I get a licq message -- anything that uses my audio
driver, I hear a fairly loud low-end pop.
Is this common? Is it a known issue I can fix? I figure it's a
problem somewhere in the following (backwards) chain:
Delta1010LT hardware (SPDIF out) -> Delta1010 alsa driver -> alsa
library -> jack.
Greg,
I cringed when I read this post. I had the same sort of problem when
I was attempting to use the RME HDSP 9652 under Linux. I was never
solved in my case and was enough for me to give up on Alsa ad Linux for
a good while. Since the HDSP line has such good support tools, hdspconf
and hdspmixer, I was able to trace a lot of stuff that you may not be
able to with your tools as I don't know what you have available.
12 Oct
12 Oct
12:15 a.m.
New subject: [linux-audio-user] Weird noise on 1010LT inputs; low level on PCM output
I'm running FC1/Planet CCRMA and Mandrake 9.2 (dual boot).
It took me a long time to get the 1010LT to pass sound from a pair of inputs to a pair of
outputs under Mandrake 9.2; I'm not sure what I changed to make it work, but now under
both operating systems, I no longer get signal through the card. IPGA, HW and ADC levels
are turned up, and channels are all unmuted, etc.
However, I am now getting a weird, low volume, almost periodic noise on all 8 analog
inputs. It typically repeats with a cycle of 1 sec., and sounds like a muffled drumbeat
with a short pause about once a second. The same noise is very loud on the mystery
capture ports 11 and 12.
Seemingly, the only major change which correlates with the loss of signal throughput and
aquisition of noise is installation of another disk drive, and creation of a FC1/Planet
system on that drive - but I lost signal on the unaltered MDK9.2 system as well. Removing
the new drive and booting MDK9.2 doesn't help.
Then I noticed that the pause correlated with qjackctl writing a line to the Messages
panel. Then I found out that running 'while true; do cat big-text-file; done' in
a terminal window almost completely eliminates this sound. Running a compile results in
silence for the duration of the compile.
So it seems to be related to my CPU going into some sort of idle state; as long as I keep
it busy, the noise is surpressed.
Anyone experience anything like this? I'm at a loss to figure out if this is a
setup/config issue, a motherboard/processor problem (its an old PIII/500Mhz), or a
hardware problem with the 1010LT. Since I lost the ability to pass signal, I'm
worried that the card might have died. Since I have the same symptoms on two different OS
distributions, with different versions of just about everything, I don't think its a
software problem.
I did finally get it to produce sound via libjack and the PCM outputs last night, but I
have to turn the output levels up all the way in envy24control and the volume knob on my
amp all the way up to hear it; with my tuner, this volume setting would produce massive
loud distortion and result in a visit from the police about a noise complaint. If I set
the patchbay to send 'digital mix' to HW out 1/2 and turn up PCM 1/2 in the
monitor mixer, I see very high levels in the monitor mix meters, dispite very low output
signal. DAC 1/2 levels are turned up all the way (Actually I resorted to turning
EVERYTHING up all the way). I can't believe the output signal level is actually
supposed to be so low. Is my 1010LT sick or dead?
--
e. j. branagan
the MUSE § Nashville, TN
30 Sep
30 Sep
2:21 p.m.
On Wed, 29 Sep 2004, Greg Reddin wrote:
This is something that has bugged me ever since I
built my Linux DAW.
When I boot up, when I start jack, when I open a web page with
Flash, when I get a licq message -- anything that uses my audio
driver, I hear a fairly loud low-end pop.
I just had a similar thing happen to me, with a Delta 66 (also an
ice1712), after playing with the command-line alsamixer. I'm driving a
pair of powered monitors from H/W Out[1,2].
Running envy24control, I found that I had set Master Clock to 88200, where
I normally keep it at 48000. In fact, switching between 88200 <-> 48000
in envy24control produces the pop every time. The pop is much louder in
the right (Out2) channel than the left, for some reason I can't explain.
Anyway, if I set it at 48000, I don't get pops when I play audio through
it ("mplayer -ao alsa1x:ice" [1]), so it seems to be related to changing
the sample rate, as other people suggested.
-Jamie
[1]
pcm.ice {
type plug
slave {
pcm {
type hw
card 1
}
}
}
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linux-audio-user@lists.linuxaudio.org
5 comments
5 participants
participants (5)
-
e. j. branagan - the MUSE -
Greg Reddin -
Jamie Guinan -
Lee Revell -
Mark Knecht