ati-drivers-9.9 works fine for me, however I am unable to use ati-drivers-9.9-r2 because it requires >=x11-base/xorg-server-1.6.3.901-r2. I would like to keep using xorg-server-1.5 because the current version of net-misc/vnc in portage requires xorg-server-1.5. It would be nice to have this changed if possible. Thanks.
That's not possible. vnc should be updated to use the latest xorg-server. Thanks