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My NVIDIA GeForce 6200 has 3 outputs: DVI, VGA, TV-out. In ubuntu 13.04 and 13.10
nouveau driver detects output connection status incorrectly. If I connect DVI cable
only, nouveau thinks than both VGA and TV-out connected. If I connect VGA cable
only, it thinks DVI and TV-out connected.
Wrong connection status leads to wrong resolution selection. Monitor connected to
DVI/VGA reports preferred resolution 1600x1200, but Xorg ignores it because it thinks
monitor is not connected. Instead it uses TV-out settings with 1024x768 resolution.
The only workarround I've found is to append video=1600x1200 to kernel command line.