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Bug#367156: kmix: hangs linux usb detection and keeps cpu at 100% when unplugging a usb audio device

On Fri, May 19, 2006 at 10:34:53AM +0200, Pierre HABOUZIT wrote:
> On Sun, May 14, 2006 at 08:04:34AM +0100, michaelm wrote:
> > Package: kmix
> > Version: 4:3.5.2-2+b2
> > Severity: important
> > 
> > 
> > Unplugging a usb audio device (in this case a usb headset), has kmix
> > at 100% cpu usage. At the same time, it prevents linux from detecting 
> > replugging of the device. killing kmix fixes it. The problem only
> > appears if kmix was run after the usb device was detected and configured
> > by alsa and appeared on kmix's card list.
>   upstream developer asks :
> Could you please try the same with the alsamixer applications ? 
> I need to know whether this KMix specific or an alsalib issue. 

If alsamixer is run with -c <card number> for the usb headset and then
the device is unplugged, alsamixer closes with:

alsamixer: function snd_mixer_poll_descriptors (POLLNVAL) failed: Success

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