The EDID file reports 1920x1200 as the only resolution supported by your monitor while according to the logs, resolutions supported by the adapter are:
1280x800x16@59.8103, 1280x800x24@59.8103, 1440x900x16@59.8874, 1440x900x24@59.8874, 1680x1050x16@59.9543, 1680x1050x24@59.9543
Because the adapter doesn't support 1920x1200, the software sets the monitor at a highest possible resolution (1680x1050).
Regards
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