moused flickering

[Warren Block]

With moused enabled or started by a USB mouse, moving the mouse pointer 
on a console screen causes other characters on the screen to flicker.

It's not very visible on a mostly-black screen, but run lptest to get 
some text and mouse the mouse around.

This seems new.  It's possible it's a memory problem with the video 
board, but it seems unlikely because there aren't any other noticeable 
problems.  This machine is running i386 8-stable.