As stated in the following link, a window will popup for the user to input the keyring password when it is autologin:
If you are autologin'ing to your machine, gdm uses su to become your user, without ever using the password. As a result pam-gnome-keyring can't pass the password along, and you need to unlock the gnome-keyring by entering the password.
If you are autologin'ing to your machine, you can set your gnome-keyring password to blank. You will no longer be prompted to enter the gnome-keyring password, but your credentials/passwords/etc. will be stored on your system in plaintext, where anyone (i.e. bad hacker) who gains access to your system could see them.
I don't think it is a good idea to set the keyring password to blank. Is there any other way to skip the input-keyring-password window when autologin?