KVM - Frequently Asked Questions
Video Troubleshooting
Keyboard Troubleshooting
Mouse Troubleshooting
Win2000 Mouse Troubleshooting
Linux Mouse Troubleshooting
Video Troubleshooting
I am getting ghosting, shadowing, or fuzzy
images on my monitor.
- Check that all video cables are inserted properly.
- Check that the monitor you are using supports the resolution and refresh-rate setting on your computer.
- Check that the graphics card you are using supports the resolution and refresh-rate setting on your computer. Connect the monitor directly into the computer you are having trouble with to see if problem still appears.
I am getting a black screen on my monitor.
- Check that all video cables are inserted properly.
- If you are not using a power adapter, check that the Keyboard cable is connected and inserted properly between the computer and KVM for the appropriate port.
- If you are using the KVM for video switching only and have no keyboard and mouse connection between the KVM and Computer, you will need to purchase the Option 9VDC, 600mA power adapter.
- Connect your monitor directly to the computer to verify that you monitor is functioning properly.
Keyboard
Troubleshooting
Computer does not detect keyboard and
you get a Keyboard Error reported at boot-up.
- Check that the keyboard cable between the KVM switch and the Computer is connected properly.
- Tighten any loose connections.
- Try swapping your keyboard with a different one.
- Try connecting the computer to a different port.
- If you are using the keyboard software that was included with your keyboard, uninstall it and install the standard Microsoft keyboard driver.
Mouse Troubleshooting
Mouse is lost when I switch to a different
channel
- Check that the mouse you are using is connected properly to the CONSOLE section of the KVM switch.
- If you are using a mouse driver that was included with your mouse, uninstall it and install the standard Microsoft mouse driver.
- Disconnect and reconnect the mouse cable attached to channel that you are experiencing problems to resynchronize the mouse connection.
- Attach the mouse directly to the computer you are experiencing mouse problems with.
- If the computer just awoke from standby mode allow, allow up to one minute to regain mouse function.
- Deactivate Power management schemes on the PC that you are experiencing problems with.
- Try swapping the mouse with a different one.
The mouse is not detected at boot-up.
- Check the cables and make sure that are inserted properly
The computer boots up fine, but the mouse does not work.
- Make sure it is plugged-in properly
- Make sure the mouse works when directly plugged into the computer. Rebooting may be necessary when trying this.
- Try a different mouse.
When I switch from one port to another, mouse movement is completely erratic.
- Make sure you do not have more than one mouse driver installed.
- Make sure that the driver is either for a standard PS/2 mouse or a Microsoft compatible PS/2 mouse.
- Make sure you do not have any mouse drivers loaded in your CONFIG.SYS or AUTOEXEC.BAT files.
- Avoid moving the mouse or pressing the mouse button when switching ports. You can rest the mouse and resume proper mouse movement simply by unplugging the mouse for about 2-3 seconds, and Plugging it back in again.
Win2000 Mouse
Troubleshooting
Sometimes when using a KVM (Keyboard,
Video, Monitor) switch and Windows 2000, the mouse isn't detected
when the computer boots.
- Until now, you would have to reboot the computer again to
get the mouse back. With a change to the INF file for the mouse
device, however, this problem can be alleviated.
- First, open the file %systemroot%\Inf\Msmouse.inf using Notepad or other text editor.
- Then, find the following line: ; HKR,,''WaitEventMask'',0x00010001,0xFFFFFFFF
and remove the semicolon from the front (the semicolon comments
the line out so that it is ignored by Windows).
You can find this line in the [Ser_Inst.HW.AddReg] section. Uncommenting this line will turn off the mouse detection when booting. - To make this change effective, you will need to go to Device Manager (right-click My Computer and choose Manage), remove the mouse (right-click, uninstall), then add it back in by choosing "Scan for hardware changes" from the Action menu.
Linux Mouse
Troubleshooting
Close gpm (the thing that does mouse for
console apps) and also change the XF86Config mouse section to be
as below.
Try to wait a few seconds after switching before moving the mouse.
# **********************************************************************
# Pointer section
# **********************************************************************
Section "Pointer" Protocol "IMPS/2" Device "/dev/mouse"
Buttons 3
# Buttons 5
# ZAxisMapping
4 5
# When using XQUEUE, comment out the above two lines, and uncomment
# the following line.
# Protocol "Xqueue"
# Baudrate and SampleRate are only for some Logitech mice
# BaudRate
9600
# SampleRate
150
# Emulate3Buttons is an option for 2-button Microsoft mice
# Emulate3Timeout is the timeout in milliseconds (default is 50ms)
# Emulate3Buttons
# Emulate3Timeout
50
# ChordMiddle is an option for some 3-button Logitech mice
# ChordMiddle
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