Im using ubuntu 12.04 with the Linux-x86_64, 295.20 nvidia driver and have disabled the internal laptop monitor through the nvidia settings utility, only enabling my NEC PA241w through display-port as a separate x screen. The monitor will display no-signal if booted with the laptop lid closed on the docking station, it works correctly if booted with the lid open. When the lid is open signal appears on the external monitor with the internal one disabled. With the lid closed there is no signal on both. This worked correctly with the 280.13 drivers, the new ones no longer work.

Can someone please help me with this?