No, megoldódott a dolog. Kerítettem egy másik (nem Samsung) LCD monitort, amit felismert a kari, belőttem 1280-as felbontásra, generáltam xorg.conf fájlt nvidia-settings-el, Samsung moncsi visszadug és voila :) megy...
Itt a conf fájl, hátha valaki még belefut és hasznára válik:
Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Module"
Load "glx"
EndSection
Section "ServerFlags"
Option "Xinerama" "0"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "keyboard"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "ACI ASUS MM17D"
HorizSync 30.0 - 83.0
VertRefresh 55.0 - 75.0
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8600 GT"
EndSection
Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
DefaultDepth 24
Option "NoLogo" "True"
Option "metamodes" "1280x1024 +0+0; 1280x1024_60 +0+0"
SubSection "Display"
Depth 24
Modes "nvidia-auto-select"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "1280x1024 +0+0; 1280x1024_60 +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection