Comment 85 for bug 1310489

Hi Alberto on my machine NVIDIA Optimus setup is no working even with the latest version of "ubuntu-drivers-common" i.e.:(1:0.2.91.8), although it does work with older version of this package i.e. (1:0.2.91.4). I have noticed one difference in the xorg.config file generated by the new and old versions of gpu-manager. Basically when using NVIDIA GPU as the main one i.e. "prime-select nvidia" the old gpu-manager sets the "Driver" value for the "intel" device to "modesetting", but the new gpu-manager sets the "Driver" value for the "intel" device to "intel".

As far as I can understand by looking into the X server log setting the "Driver" value to "intel" instead of "modesetting" prevents the X server from correctly identifying the screen on my laptop giving a black screen on boot.

Please see the file attached to this post for a comparison of xorg.conf files generated by the new and old gpu-managers.