I was under the impression that most KVMs broke the DDC
signal.
Mark.
On 10 Apr 2002, Jason L Tibbitts III wrote:
> How sensitive is DDC to things like the video cable or the presence of
> KVM switches? I just encountered a situation where DDC worked
> randomly when run through a KVM but worked fine when directly
> connected to the monitor. I've never seen any problem like this with
> 30 previous identical machines plugged into the same KVM. (I can tell
> it doesn't work because without it, the DPI defaults to 75 which makes
> the fonts come out too small.) OS is stock Red Hat 7.2 with updates,
> XFree 4.1.0 plus whatever Red Hat does to it. Hardware is an Nvidia
> GF2Ultra. I'm running the nv driver, not the binary Nvidia one.
>
> I thought that DDC was just a low speed serial connexion and thus
> should be pretty robust. I notice no loss of video clarity and no
> noise through the KVM, so perhaps it's much more sensitive than I
> believed.
>
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