No sound from Flash when something else is making sound.

[Martijn vdS]

I've just upgraded to Oneiric, and now I can't hear the sound from Youtube videos while playing music in Banshee (for example).

When I try, I get this error scrolling in the terminal I started my web browser from:
"ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave"

I've installed flashplugin-nonfree-extrasound:i386 and restarted my browser, but that didn't help.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: flashplugin-installer 10.3.183.7ubuntu1
Uname: Linux 3.0.3-030003-generic x86_64
Architecture: amd64
Date: Sat Sep 3 08:08:55 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803)
ProcEnviron:
 PATH=(custom, user)
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: flashplugin-nonfree
UpgradeStatus: No upgrade log present (probably fresh install)