Resolution on X Server does not work correct when no monitor attached

Solution Verified - Updated -

Issue

  • We have installed RHEL6 system remote to users and it is accessed through KVM Extender.
  • Display resolution defaults to 1024x768, if no monitor is connected to the KVM extender during startup of X
  • Monitor connected later supports resolution of 1280x1024.
  • With no display connected during X startup, the maximum resolution displayed is 1024x768
  • How can preconfigure X to always use desired resolution?

Environment

  • Red Hat Enterprise Linux 6

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