[ALSA - driver 0000721]: System stops completely when playing audio

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=721> 
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Reported By:                spirou
Assigned To:                karsten
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Project:                    ALSA - driver
Issue ID:                   721
Category:                   USB - usb-usx2y
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     assigned
Distribution:               Gentoo
Kernel Version:             2.6.9
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Date Submitted:             12-12-2004 13:58 CET
Last Modified:              12-29-2004 20:14 CET
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Summary:                    System stops completely when playing audio
Description: 
I have a Tascam US-428. Wehen I connect to the USB, the driver is loaded,
the USB-LED of the 428 lights up. When I try to play audio (e.g. with
aplay or XMMS), the computer immedeately stops working. All I can do is to
push the reset-button. No log-entrys, nothing.
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----------------------------------------------------------------------
 spirou - 12-29-04 11:15 
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Now I have updated the alsa-drivers, now at least the System doesn't hang
when I Play audio, but there is no output (can't hear anything). I would
assume the usual problem with muted outputs, but alsamixer doesn't find
any controls.
Another problem still exists: If the US-428 gets disconnected after its
drivers and firmware have been loaded, the keyboard is dead. I can use the
mouse normally, but if I try to do a shutdown, the system hangs again.
Version is 0.8.6, kernel is now 2.6.10-gentoo (without the kernel-built-in
alsa-modules).

----------------------------------------------------------------------
 karsten - 12-29-04 20:14 
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both keyboard dead & hangup shutting down after switching us428 off happen
here also sometimes. I think it is ok when I unload the snd-usb-usx2y
module first. ( $/etc/init.d/alsasound stop)

To the silence problem:
There is no alsa-mixer interface yet.
Is us428control activ? Check by pressing "INPUT MONITOR".
If us428control is activ, put the "MASTER" slider to 9 NOT 10.
10 magically equals 0 after us428 having started. (Seams to be some
feedback omitting strategy.) 
If this doesn't help: can you verify that audio is really being played by
watching some transport indicators?
Any difference when you set nrpacks=1 on modprobe snd-usb-usx2y?
$rmmod snd-usb-usx2y
$modprobe snd-usb-usx2y nrpacks=1

Issue History
Date Modified  Username       Field                    Change              
======================================================================
12-12-04 13:58 spirou         New Issue                                    
12-12-04 13:58 spirou         Distribution              => Gentoo          
12-12-04 13:58 spirou         Kernel Version            => 2.6.9           
12-12-04 14:20 karsten        Note Added: 0002816                          
12-12-04 14:52 spirou         Note Added: 0002817                          
12-12-04 18:51 karsten        Note Added: 0002818                          
12-29-04 11:15 spirou         Note Added: 0002994                          
12-29-04 20:14 karsten        Note Added: 0003010                          
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