Originally Posted by NvFuchs
Please connect the monitor and create a bug report as described in the sticky thread (you almost can't miss it)
Please also tell us which tool you are using in order to detect the monitor (best would be nvidia-settings)
Yep using nvidia-settings to check the monitors I have attached.
But I use a similar setup hardware wise, laptop in docking station external monitor attached to it. Boot into 2.6 + 173 and it works no problem, reboot into 2.6 + 180 and it doesn't find the external monitor.
I use dynamic twinview to run X across the 2 monitors