Comment # 1 on bug 1057654 from James Carter

Looking for the two messages when a user logs in: They appear with
no system calls (nothing visible to strace) between them.  They come
out after greeter activities are finished, i.e. after the lastlog
display, if that's turned on.  The greeter process is the one producing
them.  I looked at every ENOENT encountered by that process.  Excluded:
nonexistent translations, and hook scripts to be executed (e.g. 
/etc/mdm/PostLogin/Default and /etc/mdm/Init/:0).  For most of the 
remaining nonexistent files, I either touched them or copied authentic 
content from an alternate source, when available, but the messages still 
appeared.  Files:
    /etc/dm/Sessions/        (mkdir)
    /home/jimc/.ssh
    /home/jimc/.pam_environment
    /etc/security/uname26.conf
    /sys/fs/kdbus/0-system/bus    (/sys/fs/kdbus does not exist)
    /etc/mdm/custom.conf:0