[Bug 3731] Virtual size default can be a problem

[Eric S. Raymond]

I've seen misbehavior similar to this bug that turned out to have a
cause not listed here.

If you have a monitor capable of 20048x1536 resolution, X 7.3 will
ignore the high-res modelines it gets from EDID complaining that the
vertical size of the mode is too large for the virtual desktop size.
This problem is due to a poor choice of default virtual-desktop size and
can be fixes with an explicit Virtual declaration; I use "Virtual
2048 1536".

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Xorg resolution falling back to 640x480 and/or 800x600 when h/v freqs incorrect
https://bugs.launchpad.net/bugs/3731
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