The trackpoint of T540p is inoperable under Linux, because of the touchpad keys under Linux only function if the touch pad is activated. Is the touchpad enabled but trackpoint and touchpad come in the way.
In addition, the cursor stays in place when you click the touchpad. A problem also exists on Windows, if the touch pad is activated.
On Windows, you can disable the touch pad and still use the buttons to click. There the TrackPoint use so works. However, the speed of the pointer movement is too slow.
If you have the touchpad active, then there is also the problem in Windows that the mouse pointer when you click and slip it executes possibly something completely different than you wanted.
Conclusion: touchpad and trackpoint are insufficient.
Since the rest can continue to be ever so well. When the main input device is useless next to the keyboard, then you can not be better assessing the notebook.
There are certainly still more weaknesses. Called here is the many bloatware that no longer can deselect as before by selective recovery, and the lack of keyboard display Caps Lock and Num Lock. Instead of Keyboard LEDs There are ugly overlays on the monitor. Annoying at a 1900-EUR unit.
I think that this device makes the impression that it had been created by someone who was allowed to spoil much noble material, but has saved some places without understanding and the unit has never be tested from the perspective of a productive user.
That was my last Thinkpad.
