Ok guys, I have a solution, as Jeremy von Hoff underlined, the problem is linked to nvidia drivers, but it is not necessary to downgrade them, because adding this repository (http://www.ubuntuupdates.org/ppas/27?dist=lucid), nvidia driver and xorg are updated and both suspend and hibernate come back working.
That's all! Now i hope that they could be included in official repositories. -- [Dell XPS m1330] [Lucid lynx] [regression] Suspend and hibernate not working https://bugs.launchpad.net/bugs/553687 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs