kdm autologin failed

[Cadaver]

For some unknown reason kdm fails autologin with messagebox "Authenticating 
user...". After closeing this messagebox appears usual kdm login window. 
Nothing wrong in kdm.log.

/var/log/messages contents next errors:
Nov 23 11:57:08 fc kde-np(pam_unix)[11575]: session opened for user user by 
(uid=0)
 Nov 23 11:57:08 fc kdm: :0[11583]: pam_setcred() for user failed: Please 
ignore underlying account module
 Nov 23 11:57:08 fc kdm: :0[11575]: pam_setcred(DELETE_CRED) for user failed: 
Please ignore underlying account module
 Nov 23 11:57:08 fc kde-np(pam_unix)[11575]: session closed for user user

Destribution - gentoo, kdm version - 3.4.3



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