KVM难题 [英] KVM Cunundrum

问题描述

我正在使用带有4台PC的KVM切换器.两台PC是XP，两台是Win7 Professional X64(台式机和笔记本电脑).

每次我切换到另一台计算机并再次使用KVM时，笔记本电脑的显示分辨率都会改变.在主题为http://www.microsoft.com/whdc/device/display/kvm-win7.mspx的Microsoft文档中，对这种情况进行了完美的描述-第10页顶部的情况7.

方案7似乎表明问题是因为KVM交换机正在生成HPD删除和到达消息(无论它们是什么).因此问题似乎出在KVM切换器上.解决方案显然是将KVM切换器设置为不发送那些消息.

这是一个难题:Win7桌面上永远不会发生此问题.仅在笔记本电脑上.由于两台计算机都使用相同的KVM切换器，因此两台计算机之间Win7的配置方式必须有所不同，对吗?

我该如何深入了解?

很少有KVM制造商连续提供控制台diisplay的DDC/EDID始终会馈送到已连接的系统.请查找全职DDC/EDID函数，以避免显示器的HPD，或找到"USB DDM"为了 在KVM切换器之间切换端口时，避免使用USB键盘和鼠标的HPD.

我亲自测试了ConnectPRO UR +和UD +串行KVM切换器.他们都通过了在USB和显示切换中都注意到通过HPD错误的测试.

 

I'm using a KVM switch with 4 PC. Two PCs are XP and two are Win7 Professional X64 (a desktop and a laptop).

The laptop display resolution changes every time I switch to another computer and back on the KVM. This situation is described perfectly in the Microsoft document on the subject at http://www.microsoft.com/whdc/device/display/kvm-win7.mspx - it's Scenario 7 at the top of Page 10.

Scenario 7 seems to indicate the problem is because the KVM switch is generating HPD remove and arrive messages (whatever they are). So the problem seems to be with the KVM switch. And the solution apparently is to set the KVM switch somehow to NOT send those messages.

Here's the conundrum: The problem never happens on the Win7 desktop. Only on the laptop. Since both machines are using the same KVM switch, there must be a difference in how Win7 is configured between the two computers, right?

How do I get to the bottom of that?

解决方案

btreloar,

you're correct that Windows 7 did work differently with the HPD (Hot-Plug-Detect) error than other OSs.  In Windows 7, there is "Devices Stage" which continuously monitoring/checking all the status of connected  devices (including display, USB and audio devices).  So, any devices removed from the Windows 7 systems, there will be a "HPD" event triggered.  

There are few KVM manufacturers provide continuously the console diisplay's  DDC/EDID feeding to the connected systems all the time.   Please find full-time DDC/EDID functions for avoid display's HPD,  or find "USB DDM" for avoid USB keyboard and mouse's HPD when switching ports between/among a KVM switch.

I personally had tested with ConnectPRO UR+ and UD+ serial KVM switches.  They all pass the tests for noting passing HPD error in both USB and Display switching.

 

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