I've noticed something similar since installing Natty with 2.6.38 kernel. If I use the 2.6.35 kernel, all works fine (mostly). (It's probably unrelated to this bug, but on my system the X server seems to hang while resuming from standby)
** Also affects: linux Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/799170 Title: Ubuntu doesn't halt or reboot machine To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/799170/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs