Having used Ubuntu 12.04 and still using Mint 14.1 with an additional monitor on my Toshiba, when I installed Ubuntu 13.04 on the same laptop with that same monitor, it doesn't see the monitor.
It displays boot up on the external monitor but once booted will only see and use the laptop display.
The system otherwise works perfectly...
Processor: Intel Core 2 Duo CPU P9400 @ 2.4GHz x 2
Graphics: Quadro NVS 150M/PCIe/SSE2
The graphic driver shows as
Gallium 0.4 on NV98. That's all I know on the subject.