[Bug 1483629] Orbiting the scene doesn't work

https://bugzilla.redhat.com/show_bug.cgi?id=1483629

Peter Rathlev  changed:

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--- Comment #1 from Peter Rathlev  ---
I have what I think is the same problem, though using camera panning in Kerbal
Space Program instead.

Testing from a text VTY with "evtest" shows seperate events on press and
release for all buttons, including the middle trackpoint button. But testing
with "xev" in a running Xorg session only fires events on release (though both
press and release are then logged) when using the middle mouse button.

So it seems like the kernel does things right, but somewhere on the way to X
something stops working. I have only today upgraded to Fedora 26, so I don't
know when the problem appeared. I have not seen the problem with Fedora 25.
While searching I stumbled upon bug 1482640, but I have no idea it it's
related.

How does one debug further on this? Specifically whatever is between what
evtest reads from (kernel?) and what xev reads from (Xorg?).

(And this is like _super_ critical, not being able to play Kerbal Space Program
to its full extent is a big problem. ;-])