On a video mode with 256 colors, the Gnome logo displayed by gdm will change the color palette so much that the colors used by the Red Hat logo are affected.
*** Bug 25777 has been marked as a duplicate of this bug. ***
Should work in 7.1 but broken in rawhide now, needs fixing.
Works in rawhide now, but not in a very nice way. (If you ran other clients besides gdm and the background it might be hosed, but, the default setup works.)