Avocent Single port KVM over IP switch - Manual (Page 20)

Single port KVM over IP switch
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4.1.3.7 Video Modes
The IP-KVM switch recognizes a limited number of common video modes. When running
X11 on the host system, please do not use any custom mode lines with special video modes.
If you do, the IP-KVM switch may not be able to detect them. We recommend using any of
the standard VESA video modes, instead.