This is a continuation of the discussion on https://bugzilla.gnome.org/show_bug.cgi?id=649572 . As I wrote there:

control test: boot up and enter the password immediately gnome-keyring requests
it. Result: it doesn't ask again, the screen doesn't lock (see later...), and
the first time I ssh to another machine, a graphical dialog pops up asking for
the passphrase; the next time I ssh to another machine, it works without me
needing to enter the passphrase again.

buggy case test: boot up at 13:38 and leave the system sitting there. at 14:32,
enter the password. result: it immediately asks for the password again. as soon
as I enter it, the screen fades out and locks. after unlocking the screen, if I
ssh to another machine, I get a prompt at the console for the passphrase (not a
GUI prompt), and every subsequent ssh operation prompts at the console again.

I don't have a /var/log/auth.log . I do have a /var/log/secure which has
nothing relevant. I see these in /var/log/messages at around the time I did the
unlock (14:32):

May 27 14:32:30 vaioz gnome-keyring-daemon[1604]:
gkd_secret_service_get_objects: assertion `GKD_SECRET_IS_SERVICE (self)' failed
May 27 14:32:30 vaioz gnome-keyring-daemon[1604]:
gkd_secret_objects_lookup_collection: assertion `GKD_SECRET_IS_OBJECTS (self)'
failed
May 27 14:32:31 vaioz gnome-keyring-daemon[2389]: couldn't connect to control
socket at: /tmp/keyring-cXRgfr/control: Connection refused
May 27 14:32:31 vaioz gnome-keyring-prompt: Gtk: Failed to load module
"pk-gtk-module"
May 27 14:32:31 vaioz gnome-keyring-prompt: could not grab keyboard: not
viewable
May 27 14:32:31 vaioz gnome-keyring-prompt: could not grab keyboard: not
viewable