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Wed Jun 24 15:02:31 UTC 2009

Q. Why is the refresh rate not reported correctly by utilities that use the
   XRandR X extension (e.g., the GNOME "Screen Resolution Preferences" panel,
   `xrandr -q`, etc)?

A. The XRandR X extension is not presently aware of multiple display devices
   on a single X screen; it only sees the MetaMode bounding box, which may
   contain one or more actual modes. This means that if multiple MetaModes
   have the same bounding box, XRandR will not be able to distinguish between

   In order to support DynamicTwinView, the NVIDIA X driver must make each
   MetaMode appear to be unique to XRandR. Presently, the NVIDIA X driver
   accomplishes this by using the refresh rate as a unique identifier.

   You can use `nvidia-settings -q RefreshRate` to query the actual refresh
   rate on each display device.

   This behavior can be disabled by setting the X configuration option
   "DynamicTwinView" to FALSE.

   For details, see Chapter 13.

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