Hi Patrick, I have made these : compile an RT kernel, and "do something" in fstab, limits.conf, group. Surely there are other files to modify, but don't have heard about they yet... If you have any idea don't hesitate ! Oh, soft mode is not so good, same error comes after a while, I will try to recompile Ardour and Jack to see if it fix the problem. Anyway, thanks for your replies. Freely --fred --- En date de : Sam 29.8.09, Patrick Shirkey &lt;pshirkey(a)boosthardware.com&gt; a écrit : De: Patrick Shirkey &lt;pshirkey(a)boosthardware.com&gt; Objet: Re: [LAU] Jack0.116.2+svn3592-2 disconnect Ardour very often À: "frederic rech" &lt;f.rech(a)yahoo.fr&gt; Date: Samedi 29 Août 2009, 0h59 Hi, It's good to hear that helped. There are several steps you can take to make your system more capable of low latency and avoid xruns.  They include installing a real time kernel and making some changes to the configuration of various parts of the system. Cheers. Patrick Shirkey Boost Hardware Ltd On 08/29/2009 02:59 AM, frederic rech wrote: Thanks for replying Patrick : soft mode seems to work a lot, what do you means with "fine tune" ? --- En date de : Ven 28.8.09, Patrick Shirkey &lt;pshirkey(a)boosthardware.com&gt; a écrit : De: Patrick Shirkey &lt;pshirkey(a)boosthardware.com&gt; Objet: Re: [LAU] Jack0.116.2+svn3592-2 disconnect Ardour very often À: "frederic rech" <f.rech@yahoo..fr> Cc: linux-audio-user(a)lists.linuxaudio.org Date: Vendredi 28 Août 2009, 10h36 On 08/28/2009 05:21 PM, frederic rech wrote: Hi list, Met a problem, with Jack as far as I can understand... I installed Jack + lib and dev + qjackctl from the Sid repositories on this Lenny based P4 machine with Fluxbox as WM.. Then build Ardour from svn. When do any change in an Ardour session, at the next PLAY it says Jack disconnect Ardour cause it was not fast enough, and ask to try to restart Jack, reconnect Ardour and save the session.. Nothing can be done, and Ardour is freezed. When restarted, all connections have disappeared... I try with a version of Ardour from the repos, and it's the same, so think problem is on Jack side. Is someone in the list have had the same problem, and/or an idea to solve this ? Any help will be appreciate, thanks ! Freely --fred You can add a flag to jack commandline that will make it ignore xruns. Maybe that will help. ex. jackd -d alsa -s -s = softmode You can also fine tune your system to be able to handle lower latency playback and increase stability. Patrick Shirkey Boost Hardware Ltd _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user