LDAP limit of groups per user

[Julien Courtès <julien.courtes@yooda.com>]

Hi,
I am experiencing an issue with posix groups.
I have a user which belongs to 28 posix groups but when I use the 
command "id" on the user, I can't see all the groups whereas as root, I 
can clearly see that this member belongs to much groups.
Is there a limit of posix groups per user?
If yes, how to increase it?

Thanks

Julien Courtès