disallowing unsupported video modes.

[Anthony Jagers]

My running Xserver is configured with the highest reported video mode
available as: 1920x1080. My monitor does not support that mode. 1600x900 is
the highest my monitor will go.  This gives me headaches when starting
games. The screen will go black, with a message that the input is not
supported.
There are a few games that I have been unable to play in wine because of
this issue. Meaning, I cannot yet edit config files which would force the
game in 1600x900 mode.

How do I disallow 1920x1080 video mode for the running server, so that it
will not to never try to select that mode again?

A few of the reported video modes from Xorg.0.log But, they go as low as
640x480.
Thank You.

AMDGPU(0): Modeline "1600x900"x60.0  108.00  1600 1624 1704 1800  900 901
904 1000 +hsync +vsync (60.0 kHz eP)
AMDGPU(0): Modeline "1920x1080"x60.0  148.50  1920 2008 2052 2200  1080
1084 1089 1125 +hsync +vsync (67.5 kHz e)
AMDGPU(0): Modeline "1920x1080"x59.9  148.35  1920 2008 2052 2200  1080
1084 1089 1125 +hsync +vsync (67.4 kHz e)
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