Re: USB snd-usb-audio wedges lsusb when unplugged while playingsound.

From: Andrew Morton
Date: Sat Jul 22 2006 - 11:42:42 EST

On Sat, 22 Jul 2006 13:12:37 +0100
Ian Stirling <tandra@xxxxxxxxxxxxxx> wrote:

> 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.

Please get the machine into the wedged state, then do

dmesg -c
echo t > /proc/sysrq-trigger
dmesg -s 1000000 > foo

then send foo, thanks.
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