Dell M60 Twinview has bad display quality

[dirty666]

Hi,

when using the twinview mode on a Dell M60 the display has bad quality compared to the standard mode (only laptop monitor). My XF86 config looks like this: (Good quality with layout "SINGLE", bad quality with layout "DUAL")

> cat XF86Config
Section "ServerLayout"
Identifier "SINGLE"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "USBMouse" "SendCoreEvents"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "ServerLayout"
Identifier "DUAL"
Screen 0 "Screen1" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "USBMouse" "SendCoreEvents"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "/usr/X11R6/lib/X11/fonts/TrueType"
FontPath "/usr/X11R6/lib/X11/fonts/misc:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/misc"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi"
FontPath "unix/:7100"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc105"
Option "XkbLayout" "de"

# Increase standard autorepeat speed
# Option "AutoRepeat" "250 30"

# Swap control and capslock
# Option "XkbOptions" "ctrl:nocaps"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection

Section "InputDevice"
# If the normal CorePointer mouse is not a USB mouse then
# this input device can be used in AlwaysCore mode to let you
# also use USB mice at the same time.
Identifier "USBMouse"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection

Section "Monitor"
Identifier "WUXGA"
HorizSync 28-110
VertRefresh 43-90
Option "DPMS"
Modeline "1920x1200" 162 1920 1984 2176 2480 1200 1201 1204 1250 +hsync +vsync
EndSection

Section "Device"
Identifier "NVIDIA QuadroFXGo 1000"
Driver "nvidia"
VendorName "NVIDIA"
BoardName "QuadroFXGo 1000"
EndSection

Section "Screen"
Identifier "Screen0"
Device "NVIDIA QuadroFXGo 1000"
Monitor "WUXGA"
DefaultDepth 24

Subsection "Display"
Depth 24
Modes "1920x1200"
EndSubsection


Option "NvAGP" "1"
Option "NoLogo" "true"
Option "CursorShadow" "true"

# This twinview setup assumes a 12x10 IBM LCD
# Option "TwinView" "true"
# Option "SecondMonitorHorizSync" "31.5-90"
# Option "SecondMonitorVertRefresh" "60-85"
# Option "MetaModes" "1280x1024,1600x1200"
# Option "TwinViewOrientation" "LeftOf"

# Option "FlatPanelProperties" "aspect-scaled"
# Option "RenderAccel" "off"
# Option "NvEmulate" "30"
# Option "IgnoreEDID" "true"
# Option "UseEdidFreq" "true"
# Option "DigitalVibrance" "2"
EndSection

Section "Screen"
Identifier "Screen1"
Device "NVIDIA QuadroFXGo 1000"
Monitor "WUXGA"
DefaultDepth 24

Subsection "Display"
Depth 24
Modes "1920x1200"
EndSubsection


Option "NvAGP" "1"
Option "NoLogo" "true"
Option "CursorShadow" "true"

# This twinview setup assumes a 12x10 IBM LCD
Option "TwinView" "true"
Option "SecondMonitorHorizSync" "31.5-90"
Option "SecondMonitorVertRefresh" "60-85"
Option "MetaModes" "1280x1024,1600x1200"
Option "TwinViewOrientation" "LeftOf"

# Option "FlatPanelProperties" "aspect-scaled"
# Option "RenderAccel" "off"
# Option "NvEmulate" "30"
# Option "IgnoreEDID" "true"
# Option "UseEdidFreq" "true"
# Option "DigitalVibrance" "2"
EndSection

Does anyone have the same problems? Do you have a solution?
Dirty