I'm seeing this on an OptiPlex 990 as well. Dell just released BIOS revision A03 a few days ago, and I've installed that.
Here's what I've found: Lucid's 2.6.32-28 kernel is able to reboot the machine just fine. Neither Maverick's 2.6.35-22 nor Natty's 2.6.38-8 kernel can reboot the machine with default options. Tried adding reboot=bios and reboot=acpi, neither helps. However, adding reboot=pci *does* work. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/768039 Title: Optiplex 990 fails to reboot/shutdown -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
