With the following options in "Device" section, my laptop seems not to freeze anymore.
Section "Device" Identifier "ATI Technologies, Inc. Radeon Mobility X700 (RV410 PCIE)" Driver "fglrx" BusID "PCI:1:0:0" Option "DDCMode" "True" Option "MonitorLayout" "LVDS,AUTO" Option "RenderAccel" "True" Option "LVDSProbePLL" "True" EndSection
With the following options in "Device" section, my laptop seems not to freeze anymore.
Section "Device"
Identifier "ATI Technologies, Inc. Radeon Mobility X700 (RV410 PCIE)"
Driver "fglrx"
BusID "PCI:1:0:0"
Option "DDCMode" "True"
Option "MonitorLayout" "LVDS,AUTO"
Option "RenderAccel" "True"
Option "LVDSProbePLL" "True"
EndSection