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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1904566
Title:
jackd/alsa: only 2 channels of 4 found on usb-interface Lexicon Omega
(ALSA: cannot set channel count to 4 for capture)
Status in linux package in Ubuntu:
Incomplete
Status in linux-hwe-5.4 package in Ubuntu:
New
Bug description:
Hi,
it isn't easy to describe but i will try and give you all information
which seem to interfer with the bug ..
Sorry, my system is running with german language output.
First my environment :
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Kernel:
5.4.0-54-generic #60~18.04.1-Ubuntu SMP Fri Nov 6 17:25:16 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
alsa:
$ apt list --installed|grep -i alsa
alsa-base/bionic,bionic,now 1.0.25+dfsg-0ubuntu5 all [installiert]
alsa-utils/bionic,now 1.1.3-1ubuntu1 amd64 [installiert]
libsox-fmt-alsa/bionic-updates,bionic-security,now 14.4.2-3ubuntu0.18.04.1
amd64 [Installiert,automatisch]
libzita-alsa-pcmi0/bionic,now 0.2.0-4ubuntu2 amd64 [Installiert,automatisch]
jackd:
apt list --installed|grep -i jackd
jackd/bionic,bionic,now 5 all [Installiert,automatisch]
jackd2/bionic,now 1.9.12~dfsg-2 amd64 [Installiert,automatisch]
libjack-jackd2-0/bionic,now 1.9.12~dfsg-2 amd64 [Installiert,automatisch]
libjack-jackd2-dev/bionic,now 1.9.12~dfsg-2 amd64 [installiert]
My interface (Omega) :
$ aplay -l
**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: PCH [HDA Intel PCH], Gerät 0: ALC887-VD Analog [ALC887-VD Analog]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 0: PCH [HDA Intel PCH], Gerät 1: ALC887-VD Digital [ALC887-VD Digital]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 0: PCH [HDA Intel PCH], Gerät 3: HDMI 0 [HDMI 0]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 0: PCH [HDA Intel PCH], Gerät 7: HDMI 1 [HDMI 1]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: Omega [Lexicon Omega], Gerät 0: USB Audio [USB Audio]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: Omega [Lexicon Omega], Gerät 1: USB Audio [USB Audio #1]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
The problem:
I try to record some audio, using the usb-audio-interface Lexicon
Omega.
This interface has 4 capture channels, but all efforts to get them
working/configured failed.
Here is the commandline wich is working (but only two capture-channels
!)
$ /usr/bin/jackd -T -ndefault -dalsa -r4800 -p256 -n3 H -D -d hw:Omega -i2
-o2
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ...
hw:Omega|hw:Omega|256|3|4800|2|2|nomon|swmeter|-|32bit
configuring for 4800Hz, period = 256 frames (53.3 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 24bit little-endian in 3bytes
format
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 24bit little-endian in
3bytes format
ALSA: use 3 periods for playback
The same with 4 capture-channels fails:
$ /usr/bin/jackd -T -ndefault -dalsa -r4800 -p256 -n3 H -D -d hw:Omega -i4
-o2
jackdmp 1.9.12
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2017 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ...
hw:Omega|hw:Omega|256|3|4800|4|2|nomon|swmeter|-|32bit
configuring for 4800Hz, period = 256 frames (53.3 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 24bit little-endian in 3bytes
format
ALSA: cannot set channel count to 4 for capture
ALSA: cannot configure capture channel
JackTemporaryException : now quits...
Released audio card Audio1
audio_reservation_finish
Cannot initialize driver
JackServer::Open failed with -1
Failed to open server
So, one could say the interface is broken, but i tested on an older system
(Ubuntustudio 16.04):
$ uname -a
4.10.0-42-lowlatency #46~16.04.1-Ubuntu SMP PREEMPT Mon Dec 4 17:13:40 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux
$ apt list --installed|grep -i alsa
alsa-base/bionic,bionic,now 1.0.25+dfsg-0ubuntu5 all [installiert]
alsa-tools/bionic,now 1.1.3-1 amd64 [installiert]
alsa-tools-gui/bionic,now 1.1.3-1 amd64 [installiert]
alsa-utils/bionic,now 1.1.3-1ubuntu1 amd64 [installiert]
gstreamer1.0-alsa/bionic-updates,now 1.14.5-0ubuntu1~18.04.1 amd64
[installiert]
libsox-fmt-alsa/bionic-updates,bionic-security,now 14.4.2-3ubuntu0.18.04.1
amd64 [installiert]
libzita-alsa-pcmi0/bionic,now 0.2.0-4ubuntu2 amd64 [installiert]
$ apt list --installed|grep -i jackd
jackd/bionic,bionic,now 5 all [installiert]
jackd2/bionic,now 1.9.12~dfsg-2 amd64 [installiert]
jackd2-firewire/bionic,now 1.9.12~dfsg-2 amd64 [installiert]
libjack-jackd2-0/bionic,now 1.9.12~dfsg-2 amd64 [installiert]
libjack-jackd2-dev/bionic,now 1.9.12~dfsg-2 amd64 [installiert]
jackd is configure via qjackctl, no specification of channelcount
(only default-value:0 ).
Here's the output of jackd starting (finding 4 capture channels + 2
playback channels)
--- snip---
Tue Nov 17 12:23:43 2020: Starting jack server...
Tue Nov 17 12:23:43 2020: JACK server starting in realtime mode with
priority 10
Tue Nov 17 12:23:43 2020: self-connect-mode is "Don't restrict self
connect requests"
Tue Nov 17 12:23:43 2020: Jack: JackPosixThread::StartImp : create non
RT thread
Tue Nov 17 12:23:43 2020: Jack: JackPosixThread::ThreadHandler : start
Tue Nov 17 12:23:43 2020: Jack: capture device hw:Omega
Tue Nov 17 12:23:43 2020: Jack: playback device hw:Omega
Tue Nov 17 12:23:43 2020: Jack: apparent rate = 44100
Tue Nov 17 12:23:43 2020: Jack: frames per period = 256
Tue Nov 17 12:23:43 2020: Jack: JackDriver::Open capture_driver_name =
hw:Omega
Tue Nov 17 12:23:43 2020: Jack: JackDriver::Open playback_driver_name
= hw:Omega
Tue Nov 17 12:23:43 2020: Jack: Check protocol client = 8 server = 8
Tue Nov 17 12:23:43 2020: Jack: JackEngine::ClientInternalOpen: name =
system
Tue Nov 17 12:23:43 2020: Jack: JackEngine::AllocateRefNum ref = 0
Tue Nov 17 12:23:43 2020: Jack: JackLinuxFutex::Allocate name =
jack_sem.505_default_system val = 0
Tue Nov 17 12:23:43 2020: Jack: JackEngine::NotifyAddClient: name =
system
Tue Nov 17 12:23:43 2020: Jack: JackGraphManager::SetBufferSize size =
256
Tue Nov 17 12:23:43 2020: Jack: JackConnectionManager::DirectConnect
first: ref1 = 0 ref2 = 0
Tue Nov 17 12:23:43 2020: Jack: JackGraphManager::ConnectRefNum
cur_index = 0 ref1 = 0 ref2 = 0
Tue Nov 17 12:23:43 2020: Jack: JackDriver::SetupDriverSync driver sem
in flush mode
Tue Nov 17 12:23:43 2020: Acquired audio card Audio1
Tue Nov 17 12:23:43 2020: creating alsa driver ...
hw:Omega|hw:Omega|256|2|44100|0|0|hwmon|swmeter|-|32bit
Tue Nov 17 12:23:43 2020: configuring for 44100Hz, period = 256 frames
(5.8 ms), buffer = 2 periods
Tue Nov 17 12:23:43 2020: ALSA: final selected sample format for
capture: 24bit little-endian in 3bytes format
Tue Nov 17 12:23:43 2020: ALSA: use 2 periods for capture
Tue Nov 17 12:23:43 2020: ALSA: final selected sample format for
playback: 24bit little-endian in 3bytes format
Tue Nov 17 12:23:43 2020: ALSA: use 2 periods for playback
--- snip--
The attachment shows you there are 4 capture-channels.
The bug is described here by another person too:
https://linuxmusicians.com/viewtopic.php?f=64&t=21380
My opinion is that somewhere in development of kernel alsa has lost it's
capability to configure more than 2 capture-channels.
I wonder why nobody else is complaining, maybe because it's an usb-device ?
If you need more information, please tell me which,
i will provide them.
best regards Harry
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