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Date: Sat, 22 Jul 2006 13:12:37 +0100
From: Ian Stirling <tandra@mauve.plus.com>
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Subject: USB snd-usb-audio wedges lsusb when unplugged while playing sound.
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Config/... as my earlier message on USB - though with the bandwidth 
enforcement
turned off so it actually plays sound, when plugged into the USB1 port.

2.6.17.

Basically - playing sound with
mplayer -ao alsa:device=hw=1 or whatever - and then unplugging the
soundcard completely wedges lsusb/usb configuration, until the mplayer 
process is killed.

cat /proc/bus/usb/devices stalls.