As the problem only occurs when rebooting of any kind, but not on a cold start, this may be because the X server starts before any information has been fed to it, and it is showing the contents of the framebuffer in the graphics card's RAM until that time.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/667725 Title: old framebuffer contents show momentarily on reboot -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs