Please, help me. I was install ati drivers (ati-driver-installer-9-6-x86.x86_64.run) and have refresh only 60 Hz. I know that my monitor (Acer X223HQ) support 75 H on 1440x900 resolution.
I try to modify my xorg.conf but refresh is same - 60Hz.

xorg.conf
Code:
Section "Monitor"
Identifier "aticonfig-Monitor[0]-"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
HorizSync 31.5-80.0
VertRefresh 56.0-75.0
EndSection

Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
EndSection

Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
BusID "PCI:2:0:0"
EndSection

Section "ServerFlags"
Option "DontZap" "False"
EndSection
What can I do?