ok, i added the modeline, and i know its not because it cant detect my monitor cant do it, the resolution it doesnt detect my monitor cant do, which it can, is 2560x1920. anyway i still get an error, but different..
(WW) NVIDIA(0): Not using mode "2048x1536":
(WW) NVIDIA(0): horizontal sync width (2520 - 2080 = 440) greater than 256
(WW) NVIDIA(0): vertical sync width (1614 - 1538 = 76) greater than 16