I have the same problem on my ASUS P5GD1 Pro with the latest stable BIOS (Rev. 1012). I can confirm this trouble with Feisty 7.04 and now with Gutsy 7.10. Please find in attach my dmidecode.out and two text files with the messages displayed during the shutdown process.
** Attachment added: "Debug.zip" http://launchpadlibrarian.net/10156881/Debug.zip -- Shut Down won't power off https://bugs.launchpad.net/bugs/42160 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs