I had got hit by this bug also and after digging the code it looks like
there are two separate issues. In comment #7 the problem is probably
this:
gui/simple-greeter/gdm-user-manager.c
static gboolean
parse_ck_history_line (const char *line,
char **user_namep,
gulong *frequencyp)
{
...
re = g_regex_new ("(?P<username>[0-9a-zA-Z]+)[
]+(?P<frequency>[0-9]+)", 0, 0, &error);
...
}
The regex allows only numbers 0-9 and letters a-z either downcase or
uppercase. We have a lot of usernames with dashes and commas, so the
regex breaks here.
The bigger problem is the 8 character limit that comes from consolekit
as described in comment #2. I didn't feel like patching consolekit as it
might affect quite a few other places, so I made a quick hack to make
Include= accept script name like AutomaticLogin= does with pipe in the
end. The patch checks if the value ends in | and executes it as script
if it does. The output of the script is then used to create the
userlist. The output should be formatted as
username1,username2,username3,etc..
This is used as a temporary solution until we get something permanent
done. With this solution both the 8 character limit of ck-history and
the regex problem are avoided. As a bonus we can code the filtering
logic ourselves.
** Patch added: "add_include_script_support.patch"
http://launchpadlibrarian.net/44982938/add_include_script_support.patch
--
Network users with longer than 8 character usernames do not show up in user
list (possible fix included)
https://bugs.launchpad.net/bugs/476811
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