Installed package sound-theme-freedesktop-0.7-3.el6.noarch missing file :

  /usr/share/sounds/freedesktop/stereo/desktop-login.oga

To which set the path at startup :

/usr/bin/canberra-gtk-play - id = "desktop-login" - description = "GNOME
Login"

Who did it and why... remains a mystery. Solve the problem in the following
way:

# rpm-Uvh - force
http://mirror.yandex.ru/fedora/russianfedora/releases/11/RFRemix/i386/os/Packages/sound-theme-freedesktop-0.2-3.fc11.noarch.rpm

And this excludes the package from automatic updates:

/etc/yum.conf

[main]
cachedir = / var / cache / yum / $ basearch / $ releasever
keepcache = 0
debuglevel = 2
logfile = / var / log / yum.log
exactarch = 1
obsoletes = 1
gpgcheck = 1
plugins = 1
installonly_limit = 3
exclude = redhat-logos, sound-theme-freedesktop