Thanks for your reply. I updated xorg.conf but it didn't solved the problem.
What I did : After startup, I ran "ps -fe | grep X" and found the parameters used to launch X at startup since X was still running. I killed the X process and then I launched it again with the same parameters (as root) and logged the messages into a file (X.log.auto). Then the screen stayed black a few minutes until I decided to kill it again from TTY1. Then I ran "startx", which works pretty well (using the SAME configuration file) and I logged the messages into another file (X.log.manu). I also added the diff of these two files. ** Attachment added: "The buggy X log." http://launchpadlibrarian.net/48220990/X.log.auto -- No login screen at startup https://bugs.launchpad.net/bugs/577906 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs