I experienced the same problem on two different maschines with tridentblade
built-in graphic chipset, and i solved it with this solution:
http://sdb.suse.de/en/sdb/html/wesse...ent_mouse.html
I know it is for Suse, but it is apparently, an X-issue so maybe it works in Redhat too.
Several members have been troubled with this before, so there might be other useful tips if perform a search on the issue
