I had Mate to configure my dual screen setup with
mate-display-properties, but now I'm using
nvidia-settings for configuring it.
The new configuration seems to work, on login (lightdm) and on Awesome the configuration made with
nvidia-settings loads fine.
On Mate instead the
mate-display-properties application is overriding
nvidia-settings, I verified this by deactivating the Mate Settings Daemon and the Mate display configuration wasn't loaded but also the rest of the settings that I need.
How to reset or remove the old settings made with
mate-display-properties to prevent Mate to override