Comment 101 for bug 516520

First of all I do not see any connection between this bug and 553200. This is a login loop issue, not a keyboard/mouse issue. I also have a nvidia card and a login loop issue. I am running Ubuntu 9.10. I have found this to be a timing issue with the video card. If I log in over and over, I eventually get into the system.

There are many people with this problem. Many think they have a solution, but the problem is intermittent. At one point, I did not see an issue for about 4 weeks, then it came back.

Google "Ubuntu 9.10 login loop" and you will see various hits (including http://ubuntuforums.org/showthread.php?t=1338879). Also google "ubuntu xorg.conf". Ubuntu 9.10 does not have a xorg.conf by default. However I regenerated an xorg.conf for my system (gdm stop, sudo Xorg -configure, ...). After doing so, I still had the problem, but did not have to do as many retries. Some people report that after trying some change, they only need a couple of login tries to login. This is because the change they made CHANGED THE TIMING ON THEIR SYSTEM. People with a slower CPU will have less problems. I proved this on my computer by moving the mouse back and forth very rapidly during the login process (after entering my password). I was able to log in with success almost every time. This problem slipped through testing because the programmer had a slow system. The fix will be to add software delays during the login process to allow the nvidia card to change resolution and any other setup it needs between login and the main gui.