17 Mar
2009
17 Mar
'09
5:01 a.m.
Hi
I have a toshiba laptop with a "HDA Intel" sound card and an Edirol USB
ua-1a sound card.
atte@vestbjerg:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
Although none of these are pro cards and I don't expect them to be able
to perform well with low latency, I have a problem that I feel should be
resolveable.
If I run jack through qjackctl, clients can often "mess up" jack esp
when loading heavy stuff. This results in the sound becoming distorted
in a metal-like way. A simple restart of jack seems to resolve this.
If I run ChucK with the alsa interface, the problem often is there,
seems to be more often the lager the ChucK project (so the more there is
to load and the heavier the cpu load is).
To me it feels like "something with the soundcard setup", can anyone
recognize the problem from my description and what could I do to remedy
this? I'm hoping for some magic option to put in /etc/modules* or
something like that :-)
NB: I'm running ubuntu 8.04 with 2.6.24-21-rt kernel. Realtime
performance is setup and otherwise working fine.
--
Atte
http://atte.dk http://modlys.dk
17 Mar
17 Mar
7:32 a.m.
Quoting Atte André Jensen <atte.jensen(a)gmail.com>om>:
Hi
I have a toshiba laptop with a "HDA Intel" sound card and an Edirol USB
ua-1a sound card.
atte@vestbjerg:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
If I run jack through qjackctl, clients can often "mess up" jack esp
when loading heavy stuff. This results in the sound becoming distorted
in a metal-like way. A simple restart of jack seems to resolve this.
Are you running jack at 3 periods/buffer? The Intel cards seem to need
that to be happy.
- Peder
18 Mar
18 Mar
6:39 a.m.
Peder Hedlund wrote:
Are you running jack at 3 periods/buffer? The Intel
cards seem to need
that to be happy.
Yes, I am:
http://atte.dk/download/jack_settings.png
NB: Tried all combinations I could think of, and none seem to affect the
problem. Except smaller buffersizes seems to make if more often, and
larger make it less often.
--
Atte
http://atte.dk http://modlys.dk
17 Mar
17 Mar
8:10 a.m.
On Tue, 17 Mar 2009 09:01:20 +0100, Atte André Jensen
<atte.jensen(a)gmail.com> wrote:
Hi
I have a toshiba laptop with a "HDA Intel" sound card and an Edirol USB
ua-1a sound card.
atte@vestbjerg:~$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
Although none of these are pro cards and I don't expect them to be able
to perform well with low latency, I have a problem that I feel should be
resolveable.
If I run jack through qjackctl, clients can often "mess up" jack esp
when loading heavy stuff. This results in the sound becoming distorted
in a metal-like way. A simple restart of jack seems to resolve this.
- Which Jack version ?
- can you record the distortion ?
- Do you get Xruns, or does it just sound weird ?
Marc-Olivier Barre.
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18 Mar
18 Mar
6:57 a.m.
MarcO'Chapeau wrote:
- Which Jack version ?
atte@vestbjerg:~/music/chuck/modlys$ jackd -V
jackd version 0.109.2 tmpdir /dev/shm protocol 22
Note that the problem is also there when running straight to alsa.
Sometimes I would actually preffer that, for instance with chuck. But
using alsa leaves me without control over the problem. Since (as stated
below) the problem is *never* there on the first run of chuck after
restarting jack through qjackctl, my solution with chuck is to start
qjackctl in the beginning of my chuck-loading bash script and killall it
at the end. Since I'm using chuck live I have to do this dance, as it's
naturally totally unacceptable to have the problem, however rarely, in
front of an audience.
- can you record the distortion ?
Yes, I put them here:
http://atte.dk/download/chuck_ok.mp3
http://atte.dk/download/chuck_dist.mp3
http://atte.dk/download/ext2_ok.mp3
http://atte.dk/download/ext2_dist.mp3
They are all recorded with my edirol r09, simply recording what's coming
out of my speakers, so the sound quality is not that great. All files
are the same tune.
The first two are with chuck (first one without the problem, second with
the distortion problem), the last two are with energyXT (again first one
without the problem, second with the distortion problem).
Comparing the two clients, chuck and energyXT:
Chuck seems to be really bad at this, almost no matter what I do. Larger
projects (more to load, heavy cpu load) makes is more often. Restarting
jack from qjackctl *always* makes the problem go away the first time I
start chuck, but consecutive runs of chuck start to be infected.
EnergyXT almost never does this on light cpu loads. When the cpu load of
a project get's heavier loading that particular project increases the
chance of getting the problem. It seems that if the problem has once
been caused by energyXT, it will stay distorted (even if
closing/restarting energyXT also with a lighter project) until I restart
jack.
- Do you get Xruns, or does it just sound weird ?
No xruns.
--
Atte
http://atte.dk http://modlys.dk
5731
days inactive
5732
days old
linux-audio-user@lists.linuxaudio.org
4 comments
3 participants
participants (3)
-
Atte André Jensen -
MarcO'Chapeau -
Peder Hedlund