I can confirm this behavior both during LiveCD startup and after the initial bootup after installation. This is with Sony monitors on x86 with Herd-4.
-- [feisty] X Display in Power-Saving mode on Startup, LiveCD only https://launchpad.net/bugs/83726 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs