Part I - The Problem:
My Dell laptop is not detecting my Samsung external monitor through the HDMI cable on Ubuntu 12.04. The same computer with the same monitor is working perfectly under my Windows 7 operating system.

Part II - The Computer Specifications:
Please visit the below link for the computer specifications:

Part III - The Operating System:
The operating system i am using now is Ubuntu 12.04 - Updated daily from the official main servers.

Part IV - The External Monitor Specifications:
- Brand: Samsung
- Model Number: S23A950D
- Model Code: LS23A950DSL/XM
- Link:

Thanks in advance for your help!