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On Sun, Jan 22, 2012 at 10:07 AM, G.Wolfe Woodbury <redwolfe@×××××.com> wrote: |
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> On 01/22/2012 12:42 PM, Mark Knecht wrote: |
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>> |
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>> I played a bit with get-edid | parse-edid. Logically that stuff even |
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>> working says the VGA monitor cable is bidirectional. I started wondering if |
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>> the KVM messes up the data coming back, or what else might be going on. |
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>> Thanks for the ideas, Mark |
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> |
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> Many of the cheap KVM models do, indeed, mess up the EDID data coming from |
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> the monitor. I suspect that this is from old design specs that have too |
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> much pull-up/pull-down on the EDID lead since the boxen haven been |
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> re-engineered for newer, higher resolution and higher speed monitors. |
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> |
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> I have had problems specifically with the BELKIN KVMs. |
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> |
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> It may also be that the video drivers for Linux are just enough different |
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> (necessarily) from the MSFT drivers to not reliably sense the EDID return |
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> signals. |
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> |
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> I did as others suggested and tried several until I found one that worked. |
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> Sometimes a slightly different model/serial/part no KVM from the same |
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> manufacturer would/wouldn't work. |
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> |
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> -- |
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> G.Wolfe Woodbury |
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> redwolfe@×××××.com |
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> |
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> |
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Thanks. Sounds about like what was going on at his place and it's a |
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reasonable evaluation potentially. |
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I guess I could have made it a bit more clear early on - I'm not |
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looking to solve anything here and I'm not buying KVMs. I was just |
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curious as to the root cause of the problem. I've seen it discussed |
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periodically for over a decade but never any strong analysis of why it |
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happens. It's not a huge problem to the community. |
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|
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Cheers, |
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Mark |
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