Fedora 26 on Thinkpad T520
Broken: 2.78c as shipping with Fedora 26 for x86_64; another user on #blender reported having the same issue on Fedora 25.
Worked: Some older version, exact version not known.
Short description of error
Exact steps for others to reproduce the error
Start blender with the default scene and default settings. Press middle mouse button of the three mouse buttons below the laptop's space bar and move the TrackPoint in any direction. Orbiting won't work, that is moving left or right will not have any effect while moving up and down will zoom in and out.
The T520 also has a trackpad with two further buttons below it. While the middle mouse button emulations of both the Gnome desktop and blender are disabled there still seems to be another type of middle mouse button emulation enabled, that is pressing both thee buttons (the timing is a bit hard to hit) and using either the TrackPoint or the touchpad will orbit as expected.
An external USB mouse with scroll wheel will also work as expected.
Neither the Gnome's nor Blender's middle mouse button emulation seem to make a difference, in fact I can't seem to get it to work with the Trackpoint's three buttons.
I've tried alternative Fedora 26 desktops, that is Gnome, Gnome Classic, Gnome on Xorg, Openbox, Plasma and Xfce, all with the same result.