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Strange goings-on with a USB KVM...

Posted on 2009-05-15
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Last Modified: 2013-12-09
I have three PCs connected through a Starview 4 port Micro KVM Switch.

I find that sometimes a computer connected will not sense the mouse and keyboard after the switch has been off that computer for a time. Also sometimes the computer changes resolution - that at least is the symptom! One other time I got the blue screen of death. This has only started happening since I used the KVM.

I have selected no stand-by powering off on all USBs on all all computers. the PCs affected are Win XP.

Anyone else had any of these experiences or has any exlanations or get-arounds?

Many thanks.
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Question by:Peborgh
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Expert Comment

by:ndary
ID: 24405703
What model of the Starview KVM do you use? does it has a USB console or PS/2?
almost all USB KVM switches keyboard/mouse are been identified as a 'HID-compliant mouse/keyboard' by the operating system. when you loose keyboard/mouse check at the device manager that the 'HID-compliant mouse and keyboard' driver are there.. if there are not there then the computer does not see the KVM Switch USB keyboard/mouse anymore..

Regarding the resolution change, check if the Starview KVM has DDC support. If your KVM switch do not support DDC then what happens is when you switch from one computer to another port the PC may change his native resolution. (because the KVM Switch does not remember the DDC information on an offline port) on Windows XP & Above there is no option on the control panel to ignore DDC or disable plug and play monitor detection... you may want to search your display card manufacture for info on this or physically disable the DDC channel (pin 12 of your VGA port)  

Regarding the Blue screen ;)... did you wrote down the process that fail? this may help to find if its related to the issues above...
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Author Comment

by:Peborgh
ID: 24406518
OK, the KVM type is SV411KUSB.
What do you mean by USB console? - it works with USB kbd and mouse.
I did not install its softwareas I am happy to click thebuttons to select computer.
I cannot find any mention of DDC in the booklet that goes with the switch or on the box. However, the internet description pages tell me it supports DDC and DDC2!
The display drivers are up-to-date.
We can get back to the blue screen later - I would value comments on the above first.

Many thanks,

peter
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Accepted Solution

by:
ndary earned 500 total points
ID: 24409535
Hi Peter,

1. USB console mean USB Keyboard/Mouse you connect to the SV411K.. thanks for the info..
2. you need to install the USBKVMIn.exe utility on every Computer you connect to the KVM switch!.. and follow the instruction on the user guide.. this should help to improve the phenomena of loosing keyboard/mouse activity...  if you did not install the driver from the manufacture WinXP uses his built in 'HID-compliant mouse/keyboard'  drivers..  go to the "System Properties" => "Hardwar" => "Device Manager" and you can see that under 'Keyboards' & 'Mice and other pointing devices' the default WinXP drivers that the operating system is using to communication with the USB Keyboard/Mouse you connected to the KVM switch.  when you loosing the Keyboard or mouse control check to see if these drivers are still there and active.. (you can do this by connecting the monitor directly to the PC and switch back & forward from that KVM port)

2. The SV411KUSB user manual does not mention anything on DDC or EDID support.. so the SV411KUSB may pass the DDC info when you are connected to a computer and watching its screen.. but it may not emulate the DDC info when you switch to another computer..

Bottom line:

1. Install the manufacture software on each computer as recommended on the product manual
2. Try using another brand of Keyboard / Mouse.. there maybe compatibility issue for the KVM switch with this brand

it may be that you have a faulty KVM switch that need to be replaced/repaired.

3. Regarding the screen.. Disable the screen saver or the monitor power setting mode from the display properties so the screen will not be switched off when there is no computer activity..  this to prevent from the screen to switch off and back on when you switch to that computer.

I hope you find this information helpful
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Author Comment

by:Peborgh
ID: 24412540
Very helpful. It will be a couple of days before I can do this, but thanks. I will get back to you...

peter
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Author Comment

by:Peborgh
ID: 24482746
The repalcement KVM, along with installing the s/w and stopping screen saver appear to have achieved a fairly stable result.

Btw, the s/w works for switching PC in XP but not in Vista. I ahve arequest for help going on with Starview but am awaiting clarifications from them...

peter
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LVL 4

Expert Comment

by:ndary
ID: 24483052
Hi Peter,

i am not familiar with a Vista tool for the SV411K, you need the help from the manufacture here...
good luck
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Author Closing Comment

by:Peborgh
ID: 31581958
Do you want to know the answer from Starview when I get it?
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