From the logs, the modes are:
Modes: EDID: monitor MIT2010 (DVI to VGA ) modes: 640x480@59.9405, 640x480@67.2311, 640x480@72.8088, 640x480@75, 720x400@70.0866, 800x600@56.25, 800x600@60.3165, 800x600@75, 800x600@72.1876, 832x624@74.8364, 1024x768@60.0038, 1024x768@70.0694, 1024x768@75.0286, 1152x864@75, 1152x870@74.8591, 1280x800@59.8103, 1280x960@60, 1280x1024@75.0247, 1360x765@59.8476, 1400x1050@59.9784, 1440x900@59.8874, 1600x1200@60, 1680x1050@59.9543, 1920x1080@60 RB
1280x720 is not in this list, which is why we don't list it as an available mode for this monitor.
If we cannot read the mode list from the monitor, then we will offer lots of modes, including 1280x720, but if we can read the modes we will only offer those supported by the display.
Wim
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