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  Infuriating KVM mouse jumping 
 
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Seth Hoffman Jan 26, 2012, 04:04pm EST Reply - Quote - Report Abuse
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At work we have 5 server racks using 4 KVM units which tie back to 2 control stations. On some of the KVM channels the mouse will constantly jump all over the screen and reset back to the upper left corner, which is extremely aggravating. At first we thought it was just an issue on a bad server we were nursing, we just replaced the server with a brand new DL380 G7 and the mouse does the same thing. I have tried all 4 KVM's, different KVM cables, and several ports per KVM, all produce the same problem. I have tried PS2 and USB mice/keyboard combos as well. Other servers on the same KVM work fine.

I'm convinced it's some setting on the server itself but I can not find what it is. If I plug a mouse and keyboard directly into the server front panel they work fine.

Any ideas? I'd be a hero at work if I could get this sorted out.



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DoubleDouble Jan 26, 2012, 07:39pm EST Reply - Quote - Report Abuse
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>> Re: Infuriating KVM mouse jumping
Does the KVM have any settings? Or is it a basic model?

What is the model of the KVM?

Seth Hoffman Jan 27, 2012, 09:04am EST Reply - Quote - Report Abuse
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>> Re: Infuriating KVM mouse jumping
The KVMs are all Avocent Autoview 2015.


Dr. Peaceful Feb 01, 2012, 12:02pm EST Reply - Quote - Report Abuse
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Edited: Feb 01, 2012, 12:42pm EST

 
>> Re: Infuriating KVM mouse jumping
Whoa! A $700+ KVM!! And you're telling us you have a mouse jumping problem with that?! ;)
http://www.avocent.com/Products/Category/KVM_Appliances/Analog...iance.aspx

For something like that you should really call up the manufacturer for support, and not just ask a bunch of free-lance geeks here. ;) You can upgrade the firmware on that thing, something unlikely to have in cheap consumer KVMs. You really need specific troubleshooting instructions for hardware like that.

"I'd be a hero at work if I could get this sorted out."

What's my take for doing the work for you? LOL ;)

Here's your answer. Still recommend to call up their support for solutions.
From page 3: http://www.avocent.com/workarea/linkit.aspx?linkidentifier=id&...emid=17504
"Overview of Cable Length and Video Quality
When cable longer than Avocentís recommended maximum length is used, video does not just suddenly stop working. Instead, it will begin slowly degrading. Video quality gradually degrades at the local port, and digitizing the signal just causes even more problems. The point at which the video actually becomes unusable is subjective. Some users may be more sensitive to sluggish or jumpy mouse movements than others, for example. Avocentís definition of acceptable video quality is video that is considered visually identical to the source using the minimum network bandwith to transmit changes and producing zero packets generated on static screens.

The key factor in the amount of network traffic is the amount of changes in the video. These changes are recognized by the Avocent Dambrackas Video Compressionģ (DVC) algorithm, which compares every single pixel from one frame to the next. Every recognized pixel change is packaged and sent from the appliance to the remote user. As network activity increases, mouse latency increases, which means that mouse movement may become sluggish or jumpy.
...
Interference. Electrical interference signals can also affectsignal quality. Customers need to be aware of the potential negative effect of placing KVM cabling near sources such as AC units, power generators and fluorescent lights."


Tom Hood Mar 14, 2016, 02:23pm EDT Reply - Quote - Report Abuse
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>> Re: Infuriating KVM mouse jumping
I had a similar problem when I swapped out a Dell 15FP kmm for a Dell LED185KMM...

Reflashed the firm ware and it fixed it.


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