Is this a regression from 5.5?
As mentioned at the beginning, this bug was initially created as a clone of Bug #621082, which is a bug on RHEL6. So not a regression from 5.5.
Created attachment 454987 [details]
Install guest: "Enable audio: False"
As defualt, all guests (include rhel and windows) will not install audio device on both rhel5.5 and rhel5.6, just like the picture shows in the attach fiel. So not sure if it's a normal feature or a bug.
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*** Bug 808006 has been marked as a duplicate of this bug. ***
*** Bug 812065 has been marked as a duplicate of this bug. ***