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"NoXServerModes": when constructing the mode pool for a
display device, the X driver uses the built-in modes
provided by the core XFree86/Xorg X server as one of the
mode sources; this argument disables use of these modes.
Note that this argument does not disable custom modelines
specified in the X config file; see the "NoCustomModes"
argument for that. 

"NoCustomModes": when constructing the mode pool for a 
display device, the X driver uses custom modelines specified
in the X config file (through the "Mode" or "ModeLine"
entries in the Monitor Section) as one of the mode sources;
this argument disables use of these modes.

"NoPredefinedModes": when constructing the mode pool for a
display device, the X driver uses additional modes
predefined by the NVIDIA X driver; this argument disables
use of these modes.

"NoUserModes": additional modes can be added to the mode
pool dynamically, using the NV-CONTROL X extension; this
argument prohibits user-specified modes via the NV-CONTROL X
extension.