I just got finished installing Ubuntu 11.10 Server (AMD64) (default English - USA install, except for the drive partitioning) on a Dell PE 2850 (version 2). The install went fine, but on reboot, the local monitor (in console mode, no GUI) keeps going black about every 10 seconds for about 1-2 seconds, then reappearing (the text is still there). The monitor doesn't appear to be falling asleep (power light doesn't change). During the BIOS and RAID configuration, as well as, the install, I didn't have this problem.

Is this a known bug? Is there a boot loader setting I need for this particular hardware? Video and monitor work OK with a bootable recovery disk and the Dell bootable troubleshooting disk (no hardware errors logged). Very strange.