Bug 76124

Red Hat does not support KVM switch related bugs/problems.  The reason
for this, is that almost all KVM switches modify the signal between the
computer and the mouse/keyboard.  Many switches do so in a totally dumb
way, and others just have random hardware conflicts with certain specific
mice/keyboards.  Also, some KVM's simply do not support every single
mouse protocol out there, or the features of some mice.  In all of these
cases, and other cases, the fault of the problem is the KVM itself, and
not the operating system.

So, since there is nothing we can do about these problems really, they
are unsupported.

That said, some KVM related problems are due to the KVM making the mouse
appear to be a different mouse, by changing the protocol.  For example,
you might use a mouse normally with the IMPS/2 protocol.  Then you add
in a KVM, and now your mouse wont work.  The KVM might have changed
the mouse to use the PS/2 protocol instead.  Or perhaps vice versa.
This is a hardware issue with the KVM.

In addition, any problems that are hack-aroundable via software "potentially",
generally can't be done simply because of:

1) lack of hardware (a developer working on it, doesn't have the
   specific KVM switch which a given problem could potentially have a
   software workaround.  Also, in depth technical documentation would
   be required for the KVM, and the various mice that might be
   problematic.  In short - nobody has the hardware the problems are
   happening on that could potentially fix it, if there was a way to
   fix it (and most problems there isn't.)

2) The number of people experiencing a given problem with KVM's and
   reporting it are extremely small.  Resource allocation to look int
   a given problem a user is experiencing is dependant on both having
   access to the given hardware and its documentation (#1 above),
   and it being a widespread enough problem to justify prioritization
   of allocation of engineering resources to investigate the problem
   and/or fix it.


So, in summary, we do not support KVM's, as we _cant_ support them.

If it worked before for you, try using the same configuration files
you used before when it worked for you.  My guess is the mouse configuration
you used before, is not the same as it was now.  If that doesn't work,
then all I can suggest is to not use the KVM switch.

Sorry I'm unable to help further.

*** Bug 55339 has been marked as a duplicate of this bug. ***

*** Bug 77544 has been marked as a duplicate of this bug. ***

I'm trying to link KVM related bug reports all to this one bug report, so that
it can be used as a reference in the future.

Adding link here for completeness sake, to one reported KVM problem which
happened to be able to be worked around in XFree86 via a hack:

    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=84196

It is possible in theory that some other KVM related problems may be able
to be worked around via similar hacks, or may be fixed by this hack also.
If KVM users experiencing problems are able to create a hack to XFree86
which works around their problem also, and does not regress the software
at all, they should submit their bug report to XFree86.org via the
XFree86 bugzilla located at http://bugs.xfree86.org and if it gets accepted
into the official source code tree, it may end up in future releases of
Red Hat Linux.

Even though KVM switches still remain officially unsupported, and we do not
provide engineering support for such workarounds, if someone can
produce a workaround that doesn't harm anything, a solution may be
possible for some of these problematic switches.
for some problems.

*** Bug 85268 has been marked as a duplicate of this bug. ***

*** Bug 90595 has been marked as a duplicate of this bug. ***