Indeed this bug report descibes my situation. I followed the authors
idea of commenting out the specified line. I got the following in
.xsession-errors:

** (gnome-volume-control-applet:5187): WARNING **: Connection failed
N: main.c: Called SUID root and real-time and/or high-priority scheduling was 
requested in the configuration. However, we lack the necessary privileges:
N: main.c: We are not in group 'pulse-rt', PolicyKit refuse to grant us the 
requested privileges and we have no increase RLIMIT_NICE/RLIMIT_RTPRIO resource 
limits.
N: main.c: For enabling real-time/high-priority scheduling please acquire the 
appropriate PolicyKit privileges, or become a member of 'pulse-rt', or increase 
the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user.

So I decided to add the user to pulse-rt. If this is, what you want,
then a fix is simple, else maybe PolicyKit needs changes, but I am quiet
new to PolicyKit and have not used the manger too much, yet :-) After
logging in again with new group settings, the mixer is doing fine. No
more freezes. So the main bug report is closeable in my opinion.

Only thing that is left over is the digital output option in the output
tab. Do you want me to open a new bug report on this topic? I guess so
:-)

-- 
[jaunty] mixer_applet2 freezes session
https://bugs.launchpad.net/bugs/318310
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