Top critical review
13 people found this helpful
Works but flawed
on 28 August 2011
I finally thought I had a reasonable USB KVM switch which would alllow me to start upgrading to Win 7 and USB keyboard/mouse. The KVM switch is okay, looks like a spider with cables exiting at all angles and was working fine in my exisiting setup so I bought a new core-i7 machine with Win 7 that I had my eye on and thats when things started to go astray.
The KVM would switch between the Win 7 and XP machines without issue but switching back to the Win 7 machine it would lose the screen resolution setting and needed manually resetting, this rapidly became a pain so started investigating. The XP machines have the monitor defined correctly in windows but the Win 7 machine just thinks it is a default monitor, tried updating monitor driver but Win 7 just said not valid for 64bit OS, wasted time with the PC/monitor vendor to no benefit.
Finally it seems that Win 7 keeps sending/requesting EDID data via the Display Data Channel (DDC) which is not supported by the KVM switch so switching between machines is seen as a disconnect/re-connect of the monitor, XP does not do this repeatedly so once it is happy with the monitor, switching is okay but not Win 7.
I could buy a EDID/DDC emulator but that is expensive and is needed for every Win 7 machine so I have ordered another KVM switch which the manufacturer says is Win 7 compatible so fingers crossed it will work..
If buying a KVM switch for use with Win 7 check it supports fulltime EDID/DDC emulation otherwise you'll be frustrated, as usual Microsoft is at the bottom of all this with no easy/cheap fix so everyone has to spend money unnecessarily on new hardware