[K12OSN] Run a localapp with realtime scheduling?

Jeff Siddall news at siddall.name
Sat Nov 5 16:23:01 UTC 2011

I am continuing my quest to get pulseaudio-equalizer to work on thin 
clients and am almost there.

I set sound=false on the clients then fire up pulseaudio as a localapp 
which autostarts when the user logs in with this command:

ltsp-localapps /usr/bin/pulseaudio -n \
--exit-idle-time=-1 \
--high-priority \
--log-target=syslog \
-L "module-esound-protocol-tcp auth-anonymous=1" \
-L "module-native-protocol-tcp auth-anonymous=1"

Then I can run pulseaudio-equalizer-gtk as a localapp and adjust the 


The only issue I still have is that pulseaudio on the client when 
started with ltsp-localapps is not given realtime priority so the audio 
can get choppy.  I can see the pulseaudio daemon requesting RT but 
getting permission denied.

Back in Fedora there used to be a pulse-rt group that you had to add the 
user to to make this happen but that no longer exists in SL6.

One ugly option I suspect may work is to setuid on the chroot pulseaudio 
binary but is there a cleaner way?



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