USB KVM Switch

a) Combo of both Cat5 Extender from the console side of the KVM Switch
b) Or IP KVM, yeah you will need a box at the other end to control them.
c) What are the 3 machines doing? can you RDP onto them or install VNC and control them that way

Hey guys I have been tasked to hook up 3 machines via a KVM switch to a monitor about 30 feet from where the machines are. What do you guys recommend as far as the user being able to use the same monitor, mouse, and keyboard to control these 3 machines that are mounted in the rack. I've been doing some digging but just found CAT5 extenders for single pc and the ps2 seem to have about 10ft cabling at the most.
This topic first appeared in the Spiceworks Community

Similar Messages

IMac and Dell on a USB KVM Switch?

Hello Everyone,
Is it possible to connect the latest iMac to a USB KVM switch and use the screen to see a second Dell computer running Windows? Can you use a mini-DVI to VGA adapter? I have looked over my situation, but I'm not sure the male and female ends match up. Thanks for any suggestions.

Sorry but no, at least not in the way you want to use it. There's no video input to the screen on your iMac, and using a video capture device probably wouldn't give you the results you want.

4-port dvi usb kvm switch

i'm having trouble finding one that...
1) reads all the mac extra keys - volume up/down, mute, cd eject
2) allows hotkey switching without needing a pc keyboard (scroll lock) to program, and
3) reads dvi from my g4's adc output with it's dvi adapter
the linkskey i bought is an utter disappointment and will be going back shortly.
any suggestions?
thanks.

The 4-port Avocent is made by Addlogix. Their 2 port KVM switches are fantastic. This is the one I've used from them and highly recommend it if you need a 2 port solution.
http://www.addlogix.com/kvms/embed.asp?stuff=sekvmdvubody.html

T420 - external 24" monitor DVI- Displayport : not detected when connected via KVM switch

Hi,
I've been using a 2port USB KVM Switch from InLine for a long time connecting a mac mini and a macbook pro
to a 24" LCD. Recently I had to replace the MacBookPro with a T420. Unfortunately the T420 does not detect the
monitor, when connected via the KVM switch.
I tried:
A) T420 -> Lenovo Displayport to DVI-Adapter -> KVM-Switch -> 24" monitor: NO SUCCESS
B) T420 -> Thinkpad miniDock Series 3 DVI Port-> KVM Seitch -> 24" monitor : NO SUCCESS
C) T420 ->Thinkpad miniDock Series 3 DVI Port-> 24" monitor - > SUCCESS
D) T420 ->Thinkpad miniDock Series 3 VGA Port -> 24" monitor - > SUCCESS
So I have a workaround, but leaving out the KVM switch is not a long term option.
This is all on Win 7 professional / 64bit
Using config (A) I then installed the Intel HD Graphics Driver version 8.15.10.2342 16 May 2011
SURPRISE: during driver install, the monitor WAS detected!!!
SECOND SURPRISE: after reboot I was back in the old situation where the monitor was NOT DETECTED
CONCLUSION:
Seems like a software issue with the Intel HD Graphice driver.
ANY HINT/COMMENT/HELP highly appreciated!
Thanks,
Michael

hey mgold,
as the T420 works correctly with the external monitor and with the miniDock ; it is sad to say the the KVM switch is non-compatible.
I would recommend that you get in contact with the manufacturer of the KVM. At the same time, try uninstalling the current video drivers of your T420 and see if it makes any difference with the KVM if the T420 is running on a generic driver
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MSI has a serious KVM switch problem.

On the K8N the iogear USB KVM switches DO NOT WORK. I have two computers.. one with an asus board and one with an MSI. Works fine on the asus board. I did a search and noticed another guy was having the same problems. So its a error that MSI needs to fix. Have they fixed it yet? If not it really needs to be looked into.

Quote
Originally posted by suaZman
Quote
Originally posted by Sharkbait
I should mention that the Linkskey 2-Port Slim Desktop KVM Switch is a PS2 KVM, not USB.
Sharkbait
Well the PS/2 type Iogear works fine. It is just the USB version that does not with this board. That sux because I need the USB version so it will recognize my MX 500 mouse. If you place an adaptor on the PS/2 version it just sees it as a standard mouse thus not enabling the other buttons.
The belkin USB 2 port KVM works fine but the damn thing has no hot key switching and it is slow.
Could you not use a USB > PS2 adapter for your mouse and run your mouse off PS2 and use a PS2 KVM? I use a MX700 mouse on the PS2 port and with mouseware installed, all my extra (5) buttons work fine

KVM Switch Troubles

Until I downloaded a new mac os update, my USB KVM switch worked fine. Now, my powerbook USB port doesn't send power to the switch like it used to. I have to turn on my other computer in order for the KVM Switch to work, so I can't use my external keyboard with my powerbook unless my other computer is turned on.

Add a powered hub. G4 AL PB's have a bit of a rep as to lower power at USB.

Using a KVM switch between the Mini and a PC

I've just bought a Mini to try out the whole Mac experience.
I'm having trouble getting a KVM switch to work with the Mac.
I have a Tripp Lite B034-002-R KVM switch to share between the Mini and my WinXP PC. The switch changes over to the other computer when you press NUM LOCK twice within 2 seconds. This is working in the PC (i.e. switching from the PC to the Mac is fine) but is not working in the Mac (i.e. the switch doesn't change from the Mac to the PC).
I have a MS "Natural Keyboard Pro" USB keyboard.
Is the NUM LOCK key somehow disabled or something on the Mac? I'm hoping there's some knob I can turn to get this working.
Thanks for your help,
Tom

I bought an IOGEAR GCS632U KVM switch to move between my Mini and Windows XP Pro PC. The keyboard is an Apple Pro. The switch was perfect for several days, then every attempt at invoking the hot key mode would fail; resetting the switch would not correct the problem. IOGEAR Support had me try another keyboard, which is the current standard Apple wired keyboard (the $30 one); it had the same problem as the Pro keyboard. Also we tried other things, but all failed. Sent the KVM switch to IOGEAR and they sent me a new one. After two days using the new switch, the keyboard malfunctioned; this time it was the backward delete key that failed. Same problem using other Apple keyboard. IOGEAR Support, after going through the same previous routine in which nothing succeeded in correcting the problem, tells me to return the switch and they will send me another. Based on my experience, apparently the GCS632U model has an incompatibility problem with (some?) Apple keyboards. This is confirmed by two posts on other discussion groups sites. Also, IOGEAR Support would almost admit that to be the case. They suggested that I use a generic keyboard, but I refuse to buy one just to use that KVM switch. IOGEAR should post the potential problem on their website as a warning.
Does anyone out there know from experience that a particular IOGEAR model does work with an Apple keyboard? IOGEAR Support says that they will send me a different model if I pay the difference. Or can anyone give me the brand name and model number of any KVM switch known to be compatible with Apple keyboards (particularly one that costs less thatn $75)? A ConnectPro 2-port USB KVM switch will work, according to another discussion group post. Any advice or information will be much appreciated.

New Apple Keyboard KVM switch

I shelled out the $50.00+ for the new aluminum keyboard.
It does not work when connected with my Iogear KVM switch.
Anyone know of a solution? I have been searching for hours, and cannot find anyone who has asked this question.
I know there are new KVM boxes that don't force you to connect your mouse and keyboard separate. I always wondered why they had to be plugged in separately. Seems like a HUGE design flaw.
I want to plug in my keyboard into one USB port on the KVM and plug the mouse into the keyboard, like it should be.
ANY HELP?????
PLEASE????

I wish I had read this thread before going out to buy my new aluminum keyboard. Same trouble (with IOGear 2-port KVM switch)
I just found a review of the keyboard on Amazon which may explain the problem:
*+One word of warning, this keyboard does not appear to work with my IOGear GCS632U KVM. Normally, keyboards with LED backlighting have trouble with unpowered USB KVM switches. This apple keyboard appears to just be a simple keyboard & 2 port hub, just like the last few apple keyboards, so I'm a little surprised that it doesn't work.+*
+*... Since this keyboard is a USB 2.0 device, the KVM issue may simply be that the IOGear KVM doesn't speak USB 2.0.*+

Which kind of DVI cable to use with a KVM switch?

Hi. I have a Power Macintosh G5 and three (3) Mac Minis. I also have a Apple Cinema Display (DVI). I recently purchased a Avocent 4 Port DVI/USB KVM switch. I just got it today. It looks like a nice switch. However, it did not come with any cables. So, I need to buy some USB cables and some DVI cables. Should I buy DVI-A, DVI-D, or "dual" DVI cables?
Thanks in advance for help.

Unless you have a 30" ACD, which requires dual-link DVI, you want to buy DVI-D cables.

I'm running iTunes Radio on a WinXP PC with a KVM USB switch. With the latest iTunes update, iTunes Radio will no longer continue to stream when I switch to my work PC via the KVM switch. Can this be fixed?

I use a WinXP machine as a dedicated Music PC. I also have a separate "newer" PC to do work on. Each machine shares a Monitor, keyboard, and mouse through a KVM USB switch. I like to stream iTunes radio by starting iTunes on a selected station, then 'switch' to my work PC so that the Music PC will stream iTunes like a radio station through my Audio sound system. This used to work fine up until the latest update to iTunes. Now, when the Music PC detects the KVM switching to the other PC (basically a system hardware disconnect detection), iTunes will stop. Can I turn this 'hardward detection' issue off in iTunes?

Check your i tunes version on the PC. you need the most recent version.
Other potentials -
try a different usb port,
try a different cable.

KVM switch w/ usb i/o for keyboard mouse doesn't work [Solved]

Edit:
This problem appears to have magically disapeared. I'm still not sure why it happened or why it has ceased.
Hello Everybody,
I'm not sure why this is happening, but I've got a KVM switch that used to get "automagically" detected as "a no-brand KVM switch" on boot-up that has ceased working. I don't get this "no brand KVM switch" detected on boot-up anymore, but I can use the VGA part of the switch, at least, however the keyboard and mouse don't work unless plugged directly into the computer.
Below I've attached the result of
dmesg | grep --context=3 usb
dmesg | grep kvm
returns no result.
The most signifcant thing seems to be:
usb 1-2: new full speed USB device using uhci_hcd and address 7
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 8
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 9
usb 1-2: device not accepting address 9, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 10
usb 1-2: device not accepting address 10, error -71
hub 1-0:1.0: unable to enumerate USB device on port 2
I've googled this, and somewhere it was suggested this mean the usb device is not drawing power. The only thing that has happened that I can imagine as being the culprit between function/dysfunction here is that there was a power outage (circuit breaker tripped), and though my computers were on battery-backup, the monitor is not. I don't suppose that this could have messed up the switch?
Note this problem is uniform across 3 computers, 2 which have recently run a system update, but the 3rd has not recently run an update, this is not an Xorg problem, "K and M" don't work in either console or X.
Any help would be appreciated. Below as, mentioned previously, is the output of
dmesg | grep --context=3 usb
included on the off-chance that someone sees something significant there.
ata1.00: configured for UDMA/100
ata2.00: ATAPI: HL-DT-ST RW/DVD GCC-4480B, GW02, max UDMA/33
ata2.00: configured for UDMA/33
scsi 0:0:0:0: Direct-Access ATA WDC WD400EB-11CP 06.0 PQ: 0 ANSI: 5
scsi 1:0:0:0: CD-ROM HL-DT-ST RW/DVD GCC-4480B GW02 PQ: 0 ANSI: 5
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
USB Universal Host Controller Interface driver v3.0
huhci_hcd 0000:00:1d.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
uhci_hcd 0000:00:1d.0: setting latency timer to 64
uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:1d.0: irq 16, io base 0x0000e800
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19
uhci_hcd 0000:00:1d.1: setting latency timer to 64
uhci_hcd 0000:00:1d.1: UHCI Host Controller
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000e880
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
Warning! ehci_hcd should always be loaded before uhci_hcd and ohci_hcd, not after
Driver 'sd' needs updating - please use bus_type methods
sd 0:0:0:0: [sda] 78165360 512-byte hardware sectors (40021 MB)
uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
uhci_hcd 0000:00:1d.2: setting latency timer to 64
uhci_hcd 0000:00:1d.2: UHCI Host Controller
uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000ec00
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
usb 1-2: new full speed USB device using uhci_hcd and address 2
usb 1-2: device descriptor read/64, error -71
ehci_hcd 0000:00:1d.7: PCI INT D -> GSI 23 (level, low) -> IRQ 23
ehci_hcd 0000:00:1d.7: setting latency timer to 64
ehci_hcd 0000:00:1d.7: EHCI Host Controller
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 4
ehci_hcd 0000:00:1d.7: debug port 1
ehci_hcd 0000:00:1d.7: cache line size of 128 is not supported
ehci_hcd 0000:00:1d.7: irq 23, io mem 0xffa7fc00
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb4: configuration #1 chosen from 1 choice
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 6 ports detected
hub 1-0:1.0: unable to enumerate USB device on port 2
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
usb 1-2: new full speed USB device using uhci_hcd and address 3
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 4
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 5
rtc_cmos 00:02: rtc core: registered rtc_cmos as rtc0
rtc0: alarms up to one month
usb 1-2: device not accepting address 5, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 6
usb 1-2: device not accepting address 6, error -71
hub 1-0:1.0: unable to enumerate USB device on port 2
usb 3-2: new low speed USB device using uhci_hcd and address 2
e100: Intel(R) PRO/100 Network Driver, 3.5.23-k4-NAPI
e100: Copyright(c) 1999-2006 Intel Corporation
e100 0000:01:08.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
e100 0000:01:08.0: PME# disabled
e100: eth0: e100_probe: addr 0xff8fe000, irq 20, MAC addr 00:07:e9:50:88:58
eepro100.c:v1.09j-t 9/29/99 Donald Becker
eepro100.c: $Revision: 1.36 $ 2000/11/17 Modified by Andrey V. Savochkin <[email protected]> and others
usb 3-2: configuration #1 chosen from 1 choice
Intel ICH 0000:00:1f.5: PCI INT B -> GSI 17 (level, low) -> IRQ 17
Intel ICH 0000:00:1f.5: setting latency timer to 64
usbcore: registered new interface driver hiddev
input: Logitech USB Optical Mouse as /class/input/input2
input,hidraw0: USB HID v1.10 Mouse [Logitech USB Optical Mouse] on usb-0000:00:1d.2-2
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
intel8x0_measure_ac97_clock: measured 50831 usecs
intel8x0: clocking to 48000
input: Power Button (FF) as /class/input/input3
ACPI: Power Button (FF) [PWRF]
input: Sleep Button (CM) as /class/input/input4
reserve_memtype failed 0xf0000000-0xf8000000, track write-combining, req write-combining
X:2394 freeing invalid memtype f0000000-f8000000
X:2367 conflicting memory types f0000000-f8000000 write-combining<->uncached-minus
reserve_memtype failed 0xf0000000-0xf8000000, track write-combining, req write-combining
X:2395 freeing invalid memtype f0000000-f8000000
usb 1-2: new full speed USB device using uhci_hcd and address 7
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 8
usb 1-2: device descriptor read/64, error -71
usb 1-2: device descriptor read/64, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 9
usb 1-2: device not accepting address 9, error -71
usb 1-2: new full speed USB device using uhci_hcd and address 10
usb 1-2: device not accepting address 10, error -71
hub 1-0:1.0: unable to enumerate USB device on port 2
Thanks again!
Last edited by pseudonomous (2008-12-30 23:57:47)

i'm sorry, but this is all software related then. if you haven't already, run disk utility a few times to try to correct the error. otherwise, you should back up your info immediately if you can. if you can access another mac you can do that with firewire target disk mode. http://docs.info.apple.com/article.html?artnum=58583. the other mac has to have built-in firewire. then you can try to repair the directory with a third party utility like diskwarrior or techtool pro. if it cannot solve the problem, or if you do not want to spend the money on the software, you have no choice but to erase and install your operating system. do you already have your info backed up?? it's always a good idea. keep us posted as to how it's going for you or if you have any further questions. [ 8 ) ]

Thinkpad ultranav USB keyboard to PS/2 kvm switches

Hi
Can I have some help / info.
My problem is that i have a Thinkpad Ultranav USB keyboard ( 55Y9012 ) and need to connect to a old PS/2 KVM switches.
So ONE combo USB keyboard / mouse male plug --> 2 x PS/2 ( Female PS/2 mouse and Female PS/2 keyboard plug )
Thanks

Check your F2...Set-Up Program...and if your PS/2 selection has a CHANGE---for...AT...that may work...for your USB-type Keyboard and Mouse...I prefer PS/2...the USB...Keyboard and Mouse that came with my DELL Purchase were small ITEMS...I switched over to PS/2 for a larger keyboard...BUT...F2...System Set-Up Program should have something for an AT-computer....<<---which is a USB-type Keyboard and Mouse.
PORT Wine...!

Mac mini with KVM switch

I'm thinking of getting a Mac mini, but I need my Windows PC for some apps that aren't available on Mac and some other stuff. I can't afford to get a large monitor for a Mini if I get one, but my current PC has a big flat panel display.I noticed the KVM cable way of moving your stuff (a cale taht lets peripherals like monitors, keyboard and mice be connected to two computers so you don't need a separate one for eache computer), and was wondering if that's a possible way of using both without buying monitors, etc. for the Mini.
Is anyone doing this, and if so, what do you think of using the Mini this way? Does it work well, and what are the pros and cons of doing this?
Thanks,
Ilya Smirnov

My experience with my Belkin KVM is also good, with the exception of one thing. I can't switch back to the Mini once I've switched to the PC. I have to unplug the PS2/USB adapter from the Mini and THEN do Scroll Lock-Scroll Lock 2. The KVM then switches, and I can plug back in. Everything works fine after that. It gets cumbersome though if you want to switch seamlessly between the two.
I only use the KVM for the KM part these days since my monitor (Samsung 930b 19" LCD) is able to switch between DVI and VGA by itself. And since I'm using the Windows box mostly for gaming these days, I use the DVI with the PC and the VGA with the Mac. The KVM was able to handle it without any distortion when I ran VGA on both of them. To the best of my knowledge, there isn't a cost-effective DVI KVM switch out there yet. I could be wrong.

KVM switch and Mavericks don't play well together

I upgraded to Mavericks yesterday, and started having this very annoying problem with my KVM switch, which used to work fine with Mountain Lion. I've been using this KVM switch for my mac mini and PC, in order to share my keyboard and mouse, very stably for several months.
Basically, when switching back and forth, there is a chance that ALL the peripheral devices would stop working in Mavericks. This includes my apple bluetooth keyboard and the magic touchpad, which are not related with USB (or maybe the bluetooth chip is still hooked up via USB inside).
For some reason, screen sharing stops working too, althought the IP I was trying to connect to was the ethernet port.
If I try to do a shutdown -r now via SSH, the system tries to shut itself down, but would get stuck with a spinning animation on the screen.
There is nothing in the system log, no error message.
My KVM switch is an IOGear GCS42UW6. Connected USB devices are: Apple USB keyboard and Logitech G500 mouse.

10.8 worked well with my Mac Mini (2009) connected to IOGEAR KVM model GCS1108. My mouse is from Redmond and the keyboard is a Goldtouch.
Mavericks has a problem with my KVM switch as well. It seems to be a USB problem.
Case 1: The Mini's video is connected to the KVM switch -- mini DVI port to DVI. If the KVM USB cable (known good) is connected, the Mini chimes at boot but no grey Apple logo appears. LCD remains blank white. Boot does not progress.
Case 2: The Mini's video is connected to the KVM switch, as before. If the KVM USB cable is NOT connected, the Mini chimes at boot, the grey logo appears, and boot proceeds normally. Video is fine. I then connect the KVM USB cable to the Mini and use keyboard and mouse. KVM switching works as expected.
If the KVM USB cable is NOT connected but a keyboard and mouse are connected directly to the Mini, the boot sequence is normal. Video works.
The problem is not the hardware, all of which worked well with 10.8 (Mountain Lion). I would downgrade if Apple made 10.8 available from the App Store.

Mac Mini G4 refuses to sleep due to KVM switcher

I have a KVM switcher + powered USB hub hooked up between my Mac Mini G4 and a PC- while the PC is able to enter standby mode, my Mac always wakes up within 3 seconds of entering sleep mode. Belkin tech support said this is due to the Mac receiving USB signals (albeit me not moving the mouse, touching the keyboard, etc), and told me to ask Apple how to disable this feature.
Ideally, I'd like the computer only to wake up from a keyboard signal, but the powered hub might be making that unfeasible. However, I'm okay with taking the Mac out of sleep mode by pressing the button on its back.
Can anyone tell me how to fix this (as my LCD monitor's output is beginning to suffer)?
Thanks,
Jamie

Hi, Jamie. Welcome to the Discussions.
1. You wrote: "I have a KVM switcher + powered USB hub"It's unclear if you mean:
a. Two separate peripheral devices, i.e. KVM switchbox and a powered USB hub.
b. One peripheral device that performs both functions.1.1. Which is it, (a) or (b)?
1.2. If (b), is the USB hub is connected to each computer, or the KVM switchbox? If the former, try the latter. Don't connect the same USB hub directly two two computers2. You wrote: "Belkin tech support said this is due to the Mac receiving USB signals (albeit me not moving the mouse, touching the keyboard, etc), and told me to ask Apple how to disable this feature."If you make any change to USB devices (power them on or off, connect or disconnect them) on a USB chain that connects to the Mac, then the Mac will wake.
This feature cannot be disabled: it is a function of the circuitry.
If you look at the "USB Ports" section of the "Devices and Ports" chapter of the Mac Mini G4 Developer Note, in the subsection entitled "USB Features" you will see:"Wake Up From Sleep
USB devices can provide a remote wakeup function for the computer. The USB root hub in the computer is set to support remote wakeup whenever a device is attached to or disconnected from the bus. The keyboard that comes with the computer uses this method to wake the computer on a key press.
Connect and Resume
The Intrepid ASIC contains special circuitry that allows the computer to wake from sleep mode on connect, disconnect, and resume events. Compatible USB devices should support the USB-suspend mode defined in the USB specification."Therefore, if you put your Mini to sleep, then connect, disconnect, power-on, or power-off a USB device on any USB chain connected to the Mini, the Mini will wake.
3. It may also be that either the KVM switchbox or USB Hub (whether alone or a combined device) could be defective. I one had a similar problem where I'd put one of my Macs to sleep and it would wake immediately. Turned out to be a bad Belkin USB hub. Removing the hub restored normal sleep function.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X

USB KVM Switch

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