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38 .....The Avocent® HMX High Performance KVM Extender System Installer/User Guide
Mouse pointer of the receiver is slow
A slow mouse pointer is often related to either using dithering on the video output of one or more
transmitting computers or using VGA-to-DVI video converters.
Dithering is used to improve the perceived quality and color depth of images by diffusing or altering
the color of pixels between video frames. This practice is commonly used on Apple Mac computers
using ATI or Nvidia graphics cards. VGA-to-DVI converters unwittingly produce a similar issue by
creating high levels of pixel background noise.
HMX units attempt to considerably reduce network traffic by transmitting only the pixels that change
between successive video frames. When dithering is enabled and/or VGA-to-DVI converters are
used, this can have the effect of changing almost every pixel between each frame, thus forcing the
HMX transmitter to send each entire frame, resulting in greatly increased network traffic and
sluggish performance.
Solutions
•
For Linux, check the video settings on the computer. If the dither video box option is enabled,
disable it.
•
Apple Mac with NVIDIA graphics use the Avocent utility for Mac – Contact Technical Support.
Apple Mac with ATI graphics
•
Enable the anti-dither removal feature.
Windows PCs
•
If you suspect these issues with computers, contact Technical Support for assistance.
Replace old VGA adapters on host computers with DVI video cards.
Monitor displays pink screen
It is possible that the source computer and HMX transmitter are sending a high resolution dual-link
signal in response to a request from your dual-link monitor. However, your HMX receiver is unable
to correctly process the signal, causing the pink screen issue (DVI resolutions above 1920 x 1200
are generally dual-link).
HMX 6200T and 6210T transmitters are able to send dual-link video when requested, however, an
HMX 6200R receiver is required to process the higher resolution signal fully at the other end. Other
receivers, such as the HMX1000R, 5100R and 5200R, cannot process dual-link DVI because they
are single-link devices.
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