I noticed exactly the same thing on Herd-4. It occurred both after booting as Live CD, and then again after installation.
** Changed in: Ubuntu Status: Unconfirmed => Confirmed -- Display goes to sleep during boot-up of Feisty https://launchpad.net/bugs/85930 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs