Hi, It was a configuration problem. The solution is /etc/X11/xorg.conf.d/90-synaptics.conf. The file text is at https://wiki.debian.org/SynapticsTouchpad. Sorry for the trouble. Thanh you very much for your attention. DB Une messagerie gratuite, garantie à vie et des services en plus, ça vous tente ? Je crée ma boîte mail www.laposte.net