Definitively it should be a kernel bug because if I boot with my old Jaunty kernel, suspend works right (and of course KMS has disapeared).
$ uname -a Linux jjchico-netbook 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 i686 GNU/Linux
Definitively it should be a kernel bug because if I boot with my old Jaunty kernel, suspend works right (and of course KMS has disapeared).
$ uname -a
Linux jjchico-netbook 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 i686 GNU/Linux