On 09/28/2011 12:53 AM, S. Massy wrote: It is a jack2 message and /usually/ indicates a Xrun: A client could not be activated in time before the current cycle ended. (it is an Xrun if you run jackd in synchroneous mode and may be an Xrun in async mode.) quoting Stephane Letz - jack-dev on 15.07.2011: They are still not "strict XRun": in asynchronous mode XRuns are detected by the server which just checks that all clients have be run previous cycle. It then print something like: JackEngine::XRun : client = XXX was not run: state = 2 Note the Xrun message is produced by the server (and ends up in ~/.log/jack/jackdbus.log - or on the jackd's stderr). The JackActivationCount message is produced by libjack and printed by the client application. Since jackd 1.9.8 the latter should only be printed in verbose mode. ciao, robin