 | | | ghosting on LCD flatpanel through KVM switch | ghosting on LCD flatpanel through KVM switch 2004-02-19 - By John Haxby
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Blaise Canzian wrote:
> Has anyone experienced sub-optimal display on a Sony Viewsonic 18" LCD
> flatpanel through a KVM switch? The KVM switch I have is pretty
> cheap. The fonts are ghosted, although the redhat-config-xfree86
> finds the monitor correctly.
It's basically the cheap switch. The problem is, essentially, that the
nice square waves being generated by the graphics card are being
distorted. The ghosting is a ringing effect and you'll the opposite
side of the ghost (the left hand side) is slightly soft as well.
Short of replacing the KVM there are several things you can do. You
need to get the dot-clock frequency (I think that's what it's called)
down. This translates as reducing the refresh rate -- if it's more than
60Hz, it's too much. If you choose foreground and background colours
that have less of a signal difference it helps, except that, say red on
green looks revolting :-) (and you get a shadow because of the way the
pixels are laid out on the screen). The quality of the cables also
has an effect. I also found that the graphics card itself makes a
difference -- when the DVI packed up on my old Samsung 240T, I got a
much better picture with a nice new GeForce4 compared to the old GeForce2.
The final option is to do away with the KVM altogether. Use ssh and/or
X for access to the other machine (if Linux), VNC and windows terminal
services are quite good as well. If you install the Cygnus X server
than you can use a Windows machine to display applications running on
the Linux box. It all depends on what you want to do. Windows does
have an annoying tendancy not to work without a monitor, but you might
be able to get away with the KVM not connected to the monitor and then
use VNC or whatever.
jch
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