Having this problem myself on Acer Aspire E5-511. Can't poweroff (but can halt) and there are a few suspect dmesg entries for a cause, but it may help lead to a solution, assuming the upcming 3.18 kernel won't hold great untold treasures of course!
See bug report upstream https://bugzilla.kernel.org/show_bug.cgi?id=85931 ** Bug watch added: Linux Kernel Bug Tracker #85931 http://bugzilla.kernel.org/show_bug.cgi?id=85931 ** Changed in: linux (Ubuntu) Status: Expired => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1349740 Title: acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349740/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
