Sorry, I delete my previous message and cannot write this one in the same thread. Someone helped me a lot. It was not a problem of mouse. I had just to delete the line option "DMPS" in my XF86Config-4 and now it works ! Eric Just to help to find for other people : Dell Latitude C610 Caught signal 4 Server aborting Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,13 ?/mn) ; tél : 08 92 68 13 50 (0,34?/mn)"