KVM switches and X

[James Knott]

Fraser Campbell wrote:
> Hi,
> 
> I recently hooked up a new KVM and I am getting horrible video when in X.  In 
> text mode things appear to be fine.  Doing a bit of research I found claims 
> that KVM switches often don't provide enough "bandwidth" for high refresh 
> rates such as those used by X.
> 
> The effect that I am seeing is a bright glow (shadow?) around all fonts, it's 
> very hard on the eyes and I start getting a headache after minutes.  Other 
> than this font problem X displays correctly.  If I plug the monitor directly 
> into my desktop then X is fine, I've tried different cables and different 
> ports in the KVM to no avail.
> 
> I tried reducing X's resolution and refresh rates to the point where I had 
> quite annoying flicker but the ghosted fonts problem remained.  Does anyone 
> have an idea if this is solveable?  The KVM is a miniview ultra (apparently 
> made by IOGear).
> 
> I'm using xfree86 4.3.0 under Debian testing.  Another guy used this switch 
> under X before I did so that's why I'm thinking there might be a solution.
> 
> Thanks


Are you using a mechanical or electronic switch?  The mechanical ones 
often cause problems.  I've got a Protec "Bytelan" that works fine.

Also, X shouldn't require anymore bandwidth, than any other system, 
running similar resolution.

Another cause of your problem, may be a defective cable or connector.

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