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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