After resetting X (thanks Fabian!) I now have a single monitor working at 1900x1200. Dual monitor does not work and nvidia-settings complains with the following message:
You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.
Running nvidia-xconfig does nothing noticeable. It definitely does not allow nvidia-settings to be run.
Here's the root problem:
After resetting X (thanks Fabian!) I now have a single monitor working at 1900x1200. Dual monitor does not work and nvidia-settings complains with the following message:
You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.
Running nvidia-xconfig does nothing noticeable. It definitely does not allow nvidia-settings to be run.