Tente estas, uma de cada vez:
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Samsung SyncMaster"
#HorizSync 30.0 - 81.0
#VertRefresh 56.0 - 75.0
ModeLine "1280x1024@60" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
ModeLine "1280x960@60" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync
ModeLine "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
ModeLine "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
ModeLine "640x480@60" 25.2 640 656 752 800 480 490 492 525 -hsync -vsync
Option "DPMS"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280×1024" "1280x960" "1024×768" "800×600" "640×480"
EndSubSection
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Samsung SyncMaster"
#HorizSync 30.0 - 81.0
#VertRefresh 56.0 - 75.0
ModeLine "1280x1024" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
ModeLine "1280x960" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync
ModeLine "1024x768" 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
ModeLine "800x600" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "800x600" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280×1024" "1280x960" "1024×768" "800×600" "640×480"
EndSubSection
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Samsung SyncMaster"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
ModeLine "800x600" 40 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 interlace
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024×768" "800×600"
EndSubSection
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Samsung SyncMaster"
#HorizSync 30.0 - 81.0
#VertRefresh 56.0 - 75.0
ModeLine "800x600" 40 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 interlace
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024×768" "800×600"
EndSubSection
EndSection
Frequência:
HorizSync
VertRefresh