Have you tried manually adding a reduced blanking modeline to xorg.conf?
Modeline "1152x864R" 69.75 1152 1200 1232 1312 864 867 871 889 +hsync -vsync
Have you tried manually adding a reduced blanking modeline to xorg.conf?
Modeline "1152x864R" 69.75 1152 1200 1232 1312 864 867 871 889 +hsync -vsync