I recently upgraded to a Samsung 2343BWX monito
r for work. Lovely 23" screen at a great price. Natur
ally, I wanted to exploit the full 2048 x 1152 native resolution with my (older) MacBook Pro.
Problem: the Mac wouldn't recognize the max res of the monitor. I was stuck in 1920 x 1080 !
No obvious answers anywhere on the 'net.
Long story short, the solution is software: grab a copy of SwitchRes X 4.x and then create a custom config as follows:

Saves changes, reboot and select the new resolution via the System Display preferences.
Voila!
UPDATE: Recently, my MacBook Pro simply refused to offer the 2048x1152 setting and SwitchResX reported it as "Invalid". After much mucking about, I finally stumbled over the "Overscan" option in the main Display prefs. It was turned off. Turned it on, and life is good again.

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