Scroll Lock in XFCE will not switch KVM

[Todd Pytel]

Hi all,

I switched to XFCE recently after the frustration of trying to work
under the new GNOME. Generally, everything is super. But I do have one
fairly significant issue - Scroll Lock will no longer switch my KVM like
it used to. I have a StarTech KVM that, like most KVM's, uses double
Scroll Lock taps to signal a switch. This often required some puttering
to enable in GNOME. It was often fixable by adding "mod3 = Scroll_Lock"
using xmodmap. In a recent GNOME, that didn't work, but it did still
work using NumLock, which was just as good. But in XFCE, neither Scroll
Lock nor Num Lock will switch the KVM at all, with or without the
xmodmap tweak. The status LED's will turn on/off, but they don't trigger
the KVM. The KVM also still works properly if I Ctrl-Alt-F1 out to a
console. But in X under XFCE, they don't work properly. The keypress
does register in xev output as well. While this seems somewhat obscure,
it's actually a pretty significant usability issue for me, as I'm
frequently switching between machines and I can't easily reach the
hardware switch on the KVM.

Any insight out there as to why XFCE is interfering with this behavior?
I've never quite understood what the xmodmap tweak was actually doing at
the OS level, so if anyone understands that part and has some
explanation or links, that would also be helpful place for me to start
figuring this out.

Thanks!
Todd