I have successfully repaired my nvidia driver issue so that the driver is loaded correctly.
Within nvidia-settings I can set up my desktop to meet my needs (2 displays both at 1920x1080, twinview).
After configuring and checking that the displays was set correctly, i clicked save to x configuration file
Xorg.conf looks like:
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Ancor Communications Inc ASUS VW247"
HorizSync 30.0 - 80.0
VertRefresh 50.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 660 Ti"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-0"
Option "metamodes" "DFP-0: 1920x1080 +0+0, DFP-3: 1920x1080 +1920+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
So I assume that the 1920x1080 resolution is correctly saved to xorg.conf. But, if I now restart my PC or logout/login, I get both monitors to 1024x768.
If I then go to nvidia-settings again I can configure it successfully again to be working at 1920x1080.
So I think the driver is ok because the resolution is configureable and works as expected, but during boot it does not load the correct values.
How can I tell my system to use the high resolution during boot?