Your laptop is recognizing your monitor as a TV. It is the signal that is being output from your Macbook Pro to the Samsung monitor. With HDMI the output is not text friendly.
The simple solution is to buy mini-display port to DVI or mini-display port to VGA adapter (depends on what other inputs your monitor has). It will resolve the issue.
A not so simple solution is to search on Google and you will come across a modified file that needs to be pasted somewhere in User's library or System's library (not sure which one) and it will allow the monitor to be recognized as a peripheral display than a TV using HDMI.
An intermediate and somewhat unfounded solution is to play with underscan/overscan settings on your Macbook Pro or the Samsung monitor or both. Also, you can use the alt/option key when you select the resolutions under System Preferences>Display; it will allow for a few more options to become available.
My solution was to go buy an adapter and the issue was resolved.
Good luck