Display manager runs after login only

Hello Debian users! Please help me with a very strange X11 problem: I can run xdm, kdm or gdm after logging in from the command line only. During system boot x cannot be started. The XServer reports a fatal error: "Caught signal 11. Server aborting". I even can login as a normal user and run star

NVIDIA GForce2 MX400

Dear Debian users, ist there anybody on the lists who has some experience with NVIDIA's GForce 2 MX 400 video chip. I had a NVIDIA Riva TNT 2 chip perfectly running with the xserver_svga on my potato 2.2 r0 system with kernel 2.2.17, but now with the MX chip this xserver just returns senseles