The problem is in the following file: /etc/security/limits.conf Where it says rt_priority it must say rtprio This was already fixed but it seems that after an upgrade some package changed the configuration. In a terminal (as root) type: nano /etc/security/limits.conf Then edit, this line: @audio - rt_priority 99 And change it, so it looks like this: @audio - rtprio 99 Then <ctrl+O> to save changes, <enter> to confirm and <ctrl+X> to exit nano. Reestart the pc. With these modifications you'll get realtime capabilities without using the realtime-lsm module. Ariel. Musix GNU+Linux Collaborator.