I'm also affected by this. I'm running Ubuntu 6.06 with kernel 2.6.15-26-amd64-k8, but can confirm it also happens with 2.6.15-25-amd64-generic, 2.6.15-26-amd64-generic and 2.6.15-27-amd64-k8. I've only ever had the problem since installing Dapper. My USB devices powered down correctly when shutting down from Breezy. Other OS's on my system work fine as well.
-- Mouse doesn't get turned off on system shutdown https://launchpad.net/bugs/48773 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs