Comment # 7 on bug 1227068 from Stefan Dirsch

(In reply to Tobias Burnus from comment #5)
> Trying with *Wayland* after that change:
> 
> When kdm has been started without the external screen, i.e. it is only
> displayed on the laptop, it is as above: Wayland only has the external
> screen.
> 
> When kdm has been started with both screens available, i.e. showing the
> enter-password login on both screens, it shows the startup wheel on the
> external screen and then everything gets black and an oversized mouse
> pointer is visible that can be moved between external and internal screen;
> it looks okay in terms of right/left; at least on the higher-res laptop
> screen, the stops half way to the top and it looks as if one can move is far
> below the visible screen to the bottom, but I might have missed to spot tip
> of the mouse pointer at the bottom of the screen.
> – As the keyboard didn't seem to work, I had I rebooted with SysRq +
> s(ync),u(nmount),b(oot).

Ok. Not sure if I understand this all correctly. Maybe you can make a video
with your smartphone - if available - to demonstrate it.