+++ This bug was initially created as a clone of Bug #519388 +++

When removing an external USB audio device (Creative SB 24 external in my case but usb headsets might suffer same behavior), the mixer applet starts eating one core cpu time (as I think it is single threaded). It does not necessarily have to be a secondary card, in my system the built in card is bios-disabled so only usb sound is available.

Steps to reproduce:
1. Connect a sound device via USB, might be a secondary.
2. Load a mixer applet and configure it to manage the usb device via ALSA.
5. (not sure if this is needed) Make the external card the default card in ALSA.
6. Unplug the usb sound device.
7. Almost immediately the process 'mixer_applet2' starts eating the CPU time.


Actual results:
You can see the process 'mixer_applet2' using 100% of one core cpu time on top, atop etc.
After replugging the card, open the preferences window and select OSS then ALSA again to revert the applet to its normal non cpu hungry state.

Expected results:
Awareness of hotplug sound devices (might be achieved via d-bus).
When unplugging a device turn the speaker icon to the n/a icon.

Does this happen every time?
Yes