[GeForce 6] Video distortion using KVM switches

When connected through a KVM switch the video quality from my main computer using a 128mb GF6800 from MSI becomes distorted, blurry, and the text very hard to read. However, my second computer using a GF4 4200ti looks fine.
I thought it was a defective switch but I've tried 2 kvm switches from different manufacturers with different cables both with the same result.
Both computers are at 1280x1040 resolution, 60Hz refresh rate... changing the refresh rate nor the resultion helped.
However, when my main computer is connected directly to the monitor the video quality is fine... which makes me completely lost. Is there anything I can do besides beating everything with a baseball bat??

was hoping there'd be a way to clear things up after getting use to using 2 computers at once
unfortunately can't fit an oldstyle monitor on the desk where i just moved to and can't afford another lcd :/

Similar Messages

[QEMU/KVM] Use KVM switch to switch mouse/kayboard between host and VM

I finally have my QEMU/KVM setup running and working as I want it, except for one thing. I have a KVM switch (a piece of hardware not the hypervisor ) to switch audio and video. It also offers the feature to switch mouse/keyboard between to Computers. Here is the relevant excerpt from my lsusb:
Bus 002 Device 048: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 047: ID 0557:8021 ATEN International Co., Ltd CS1764A [CubiQ DVI KVMP Switch]
Bus 002 Device 046: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 045: ID 0557:8021 ATEN International Co., Ltd CS1764A [CubiQ DVI KVMP Switch]
The device named "Logitech, Inc. Unifying Receiver" is the dongle for my mouse and keyboard. The first problem is that both devices (in both states of the switch they both appear) have the same device id 046d:c52b. This can be solved by telling qemu to identify the device by #bus.#device instead of the id. The problem is that after each switching the device number increases. This makes sense as for the system the switching process is as if the device was unplugged and plugged in in a different usb port. Therefore the device would probably be disconnected from the VM when it was assigned on the VM's startup (is there a way to add usb devices on the fly to a vm without typing an add_usb command in the qemu shell). Do you have any ideas what I could do?
EDIT: Just found about QMP. Would it be possible to save an initial condition (mouse/keyboard is on host) and fetch new devices busses after switching (udev?) and switch the saved sate? If the state is now "m/k should be on the vm" one could send qemu an adequate add command.
EDIT2: I found out that my mainboard's usb is organized using 3 usb controllers (2x2.0, 1x3.0 each with 4 ports). I want to pass one of those PCI controllers to the VM but all I get is a black screen.
EDIT3: I tried the other usb controller and it worked. Well, kind of. I moved the mouse in a circle and made a right click. Than I was not able to use the mouse or the keyboard anymore. Should I consider buying a PCI USB2.0 controller as that might be easier to forward?
Last edited by fkoehler (2015-04-29 23:50:07)

This article has someinteresting information in the comments. You don't have to use a kvm switch neccessarily. I for one prefer a software solution.
Okay, so to make things clear: I do not switch keyboard/mouse. I keep them shared between both OS, using Synergy. The host OS runs a web server, and the guest OS runs a client – they exchange mouse position information, so that at any time only one of them receives ‘clicks’. This is great for both multi- and single-monitor setups.
Another story is that I have two video outputs connected to a single monitor, and I would like to switch between them without using the buttons on the monitor itself. For this, I use the I2C that is embedded within HDMI or DP.
Almost all monitors support DDC, but there are scarce apps that can make us of it. There is DDCcontrol for linux, but it is completely outdated, and failed to work with my particular monitor. So I ended up getting to know the VESA DDC standard, reading the source of that tool and several similar ones, and created a simple C program (source) that works in case of my setup. Most likely it will not work elsewhere, but it should give you a nice starting point for communicating with the monitor. The fragile spots are line 41 – you may need to change the i2c bus number the the one correct for your system, and you may need to prepare other data to send to the monitor (68 and 71) if you want to switch between other outputs than I do. Refer to the standard in order to prepare them.
As for how to change his source code to help you, I am not of much help right now as I do not know the DDC protocol. Hope that helps.
Last edited by noctlos (2015-04-30 16:01:45)

Home use KVM switch for Ultra60 , Blade 100& Intel Boxes

I have go a Ultra 60, a Blade100 and some Intel boxes at home. Tired of connecting and disconnecting the monitors and keep my desk full of mouses and keyboards. Any one know which type of KVM switch is suitable capable for these boxes and does not cost much? Thanks for your suggestion!

Hello,
<i>... Ultra 60 not easily support I still want to know if there is some option to support the Blade 100 in the KVM as well.</i>
The Ultra 60 and other systems with the single Mini-DIN connector for the keyboard with the mouse attached require a converter to be able to attach a PS/2-keyboard and -mouse. The keyboards are available for different countries with different layouts (mappings). There are DIP-switches at the keyboard, the settings are read by the system to detect the mapping of the keyboard. There are additional function keys (Help, Stop, ..., Compose, Power On/Off, ...).
A PS/2 keyboard lacks these switches and the additonal function keys. These features must be emulated by the adapter/emulator.
You can attach a PC USB keyboard (and mouse) to Suns with USB keyboard port, but these keyboards still lack the addtional function keys and the capability to "tell" the system the national mapping. If the system can't detect the locale, a standard mapping (US) is used.
The keyboard mapping can be forced when the operating system has been loaded. Review the posting by J.Keil on the Sun OS Forum about using a non-self-identifying keyboard.
<b>Finnish KB on Fujitsu-Siemens Sparc </b>
I hope this helps other people when they use the search function ...
Michael

[SOLVED]Keyboard layout messy after wake up or using KVM-switch

After waking up the computer from suspension or using my KVM-switch, the keyboard layout is pretty messed up.
"qwertzuiopü+" becomes ".,ñpyfgchl"
"asdfghjklöä#" becomes "aoeuidrtnsḉ"
"<yxcvbnm,.-" becomes "<-qjkxbmwvz"
I know the origin of the problem is that XKB is only set by my .xinitrc. But how can I bypass this? How can I set XKB with the German layout by default?
Last edited by Dun (2015-01-21 13:41:50)

alphaniner wrote:
Try a conf file in /etc/X11/xorg.conf.d. Here's mine:
$ cat /etc/X11/xorg.conf.d/00-keyboard.conf
# Read and parsed by systemd-localed. It's probably wise not to edit this file
# manually too freely.
Section "InputClass"
Identifier "system-keyboard"
Driver "evdev"
Option "XkbLayout" "carpalx"
Option "XkbOptions" "ctrl:swapcaps"
EndSection
Ah thank you very much!

Hotkey assignments for KVM switches

SVIEW02, SVIEW04, SVIEW08 - HOLD down the ALT, CTRL, and SHIFT keys at the SAME TIME. Press the number of the computer that you would like to use, as assigned by the KVM Switch, and then let go of all the keys. Press ENTER, and the machine selected will now have use of the monitor, keyboard and mouse.
PS2KVM2 - PRESS CTRL, CTRL to change to the other machine.
PS2KVM4 - PRESS ALT, then CTRL, SHIFT, then the NUMBER of the desired port, then ENTER.
KVM100SKv1 - PRESS ALT, then CTRL, SHIFT, then the NUMBER of the desired port, then ENTER.
KVM100SKv2 - PRESS CTRL, CTRL to change to the other machine.

I use kvm switches, It is useful information, Thanks.
Message Edited by alanro on 03-27-200705:02 AM
software reviews

DVI KVM switch to use with iMac and Cinema Display

I currently have a 20" iMac that I use with a 20" Cinema Display. I'd like to share the Cinema display between the iMac and a Dell computer. Assuming this can be done, are there any recommendations for a DVI-KVM switch? Most important is no loss in video quality when the Cinema display is used with the iMac. The Dell is seldom used and even a straight DVI switch without mouse and keyboard sharing would be OK.
 20" Intel iMac + Cinema Display + Sony HDR-HC7 HD camera Mac OS X (10.4.8) All tools, no talent!

I am also trying to link a Mac Mini and a HP PC with an nVidia FX5500 graphics card via a KVM switch. The mini works fine but the PC does not sync up and the screen is blank and the little white light on the lower right is blinking.
Any news on your question would be appreciated
mac mini Intel dual core Mac OS X (10.4.6)

How to use a KVM switch with my IMAC

Have a new IMAC and wanting to use my KVM switch - is there a way to use it?
Thanks,

Zimmer1956 wrote:
Have a new IMAC and wanting to use my KVM switch - is there a way to use it?
If you mean you want to send video from another computer to the iMac display,
the answer is: NO WAY. iMacs have no video input; the mini-DVI is output-only.
If you want to send iMac video to a shared external monitor, it might work -- if
you can find a KVM switch for a USB keyboard & mouse.
Looby

How to use a KVM switch with a Pavillion 23

I have a Pavillion 23, and it has no VGA port, but it does have a USB port.
I have another machine that is not an all in one pc, and I was hoping to use a KVM switch to use the Pavillion 23's video monitor capabilites, and just toggle between it and my other machine. I have a USB to VGA converter. Can this work? Will this create some sort of infinate loop? I have a sneaking suspicion that I need a 2nd usb to VGA converter. Am I right?

Hi,
This will be the out port, not in port therefore you can't use the 23" monitor.
Regards.
BH
**Click the KUDOS thumb up on the left to say 'Thanks'**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

Using iMac with KVM switch

Hello --
Can someone tell me if I purchased a new iMac with either the corded or cordless keyboard, could I hook up the keyboard, mouse, and monitor to a KVM switch and use the keyboard, mouse, and monitor with a PC? The KVM switch uses USB for the keyboard/mouse input.
I have to use the PC for work, but I don't want two keyboards, mice, and monitors on the desk, if anyone's curious why I'd want to do this.
Thanks!
Paul
Future iMac Mac OS X (10.4.4)

Someone correct me if I'm wrong... (I'm sure they will!)... but I don't believe the iMac can display a video signal input from another source (pc). It certainly can output to a second monitor, but that won't solve the space problem posed by two monitors on your desktop.
TiBook G4 1G, PMac G4 dual 1G, MacPlus Mac OS X (10.4.4)

What kind of KVM switch can I use to monitor sun rack with 490s, 245s, and

Hi,
What kind of KVM switch can I use to monitor sun rack with 490s, 245s, and T2000s ?
Ushas Symon

It sounds like the customer and server room operator are using a Microsoft/X86 mindset. There are several selling points on using RSCs & SCs. First off are the big 3 that are easy for any good server room operator to understand: cost, space & power. If you don't have to buy a 1U Tripp-lite pull out rack KVM console ($1700) and a video card for each of your SUN servers ($400, yes SUN vid cards are $$$), you start off by saving several thousand dollars.
Next you need to let them know that you require remote access to the systems from your desk and a standard KVM doesn't allow this (with Unix, if you have to get up from your desk then its a hardware problem). They can choose to purchase a network enabled KVM, but that adds $700 to your $1700 KVM. By using the SC you will be able to administer the system remotely.
Third, remember that SUNs do not show all the critical boot information on a frame-buffer console output. If you are in diagnostic mode during boot, the monitor doesn't show results until it completes. If some process is stuck (missing NFS or fibre-channel hard mounts, memory tests, etc) then you need to be able to see it to fix the problem. Plus, console frame-buffers only give you 25 lines of output that you can't scroll back.
The only small hitch is security. The new SCs (on T5220s) have SSH built in, but the older V240s and V490s use telnet which some security people balk at. The solution that we used is to put the older system SCs on a private LAN. Access to that private LAN from our intranet is via a SSH enabled dual-homed (non-routing) workstation with local user accounts. We SSH to that workstation & then telnet to the SC on the relevant server. That solution allows me to access our servers that are 40 miles away, saving response time to solve customer problems. A crude diagram is below:
your workstation------intranet------[dual homed, non-routing workstation]------[inexpensive switch]------[server SC]
Good luck.

How do i connect my mac mini to a kvm switch using the hdmi to dvi adapter?

I want to connect my Mac Mini using the HDMI to DVI adapter to a KVM switch cable. I have an Iogear KVM switch. The cable from the KVM switch has a male VGA end connection. I have been trying to determine the right adapter to connect the female DVI connection to the male VGA connector. I will be using the Mac mini and a PC running through the KVM switch. This is doable as the iogear switch is compatible with both a PC and a Mac. Any ideas out there? Thank you.

You would need to get HDMI or DVI to VGA CONVERTER, not a simple adopter. The converter requires USP connection for power. HDMI is only digital while VGA is analogue.
http://www.newegg.com/Product/Product.aspx?Item=N82E16812699001&nm_mc=EMC-IGNEFL 070414&cm_mmc=EMC-IGNEFL070414-_-EMC-070414-Index-_-AudioVideoSplitters-_-126990 01-L019B
If your MIni has a mini displayport or Thunderbolt port yu can get a les expensive mini displayport to VGA afopter.

My classic video ipod won't switch back to regular video mode after using it on an elliptical. The port still allows me to charge and works on the elliptical and treadmill but it will no longer change modes to allow me to watch my shows on the ipod screen

My classic video ipod won't switch back to regular video mode after using it on an elliptical. The port still allows me to charge and works on the elliptical and treadmill but it will no longer change modes to allow me to watch my shows on the ipod screen

From the iPod's Main Menu choose Videos -> Settings and make sure TV Out is set to Off.
Otherwise, try a hard reset as well. To do this, press and hold both the Select (Center) and Menu buttons together long enough for the Apple logo to appear.
B-rock

Use of KVM switch with an IMAC

Have a new IMAC and wanted to use my existing IOGEAR KVM switch. Normally, the two computers plug into the switch and from the switch to the computer. Since the computer and monitor are all one, is this still possible - or how do I use this with the IMAC?

You show that you are running Tiger. This is the Leopard forum.
I suggest reposting in the iMAC forum regardless. It is not a Leopard issue it is a hardware question.
http://discussions.apple.com/category.jspa?categoryID=132

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.

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.

[GeForce 6] Video distortion using KVM switches

Similar Messages

Maybe you are looking for