Hi Rick,
Sorry it's taken so long to respond to this issue. Are you still
experiencing it with the released Intrepid?
It sounds to me like the KVM is somehow corrupting the EDID data
provided by the monitor. There are two useful tools for looking at the
EDID information:
xrandr --verbose
and, from the read-edid package:
get-edid | parse-edid
I would suggest running each of these commands once with the monitor
directly attached, and once with it through the KVM. See if there are
any notable changes, and attach all the output from these commands.
Meanwhile as a workaround, you could also experiment with the IgnoreEDID
or NoDDC options (see `man radeon`).
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Incomplete
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[radeon] xorg gives black screen with external monitor connected through
KVM-switch
https://bugs.launchpad.net/bugs/257941
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