Comment 2 for bug 1451798

I have a ThinkPad X230T running 15.04 with Unity. I confirm that thinkpad-rotate flip causes the screen to go black with just the cursor visible and responsive to the window it's over (albeit with stylus input inverted relative to the screen). ctrl+alt+F1 then ctrl+alt+F7 serve to restore the windows (and stylus input is correct relative to the screen after this).

I would be happy to run any tests if it would be useful to diagnosing and fixing this bug.