Same problem on my small desktop server running 2.6.15-26-server kernel. The machine is based mostly on the SiS chipset, SATA Drives and standard onboard graphics & LAN. It's a intel P4-Celeron 2.6Ghz
This machine had no problems re-booting after shutdown with Hoary, Warty, and Breezy versions - Just since I have Dapper installed. Interesting though is that the dapper server install CD is able to restart the machine with no problem. This is a big problem for anyone wanting to install dapper server because if you can't reboot your headless server remotely then installing Ubuntu Dapper Server is just not a viable option at all.. -- Power down after shutdown does not work... https://launchpad.net/bugs/43961 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
