[Samba] winbind: uid range is ignored

[steve]

Hi everone.

Ubuntu 12.04 v3.6 clients with winbind joined to 12.04 Samba4 DC

Clients:
smb.conf
[global]
realm = polop.site
workgroup = POLOP
security = ADS
wide links = Yes
unix extensions = No
template shell = /bin/bash
winbind enum users = Yes
winbind enum groups = Yes
idmap uid = 300000-400000
idmap gid = 20000-30000

/etc/nsswitch.conf
passwd:         compat winbind
group:          compat winbind

Problem:
The uid range is ignored. Both uid and gid come from the gid range. e.g.:
getent passwd steve2
POLOP\steve2:*:20007:20000:steve2:/home/POLOP/steve2:/bin/bash

Why is the uid range of 300000-400000 ignored?
Cheers,
Steve