--- Comment #3 from Fabian Vogt <> ---
I just confirmed that it's indeed kscreen what's causing this: Turing the
laptop screen off in the kscreen kcm kills the session as well.

This laptop uses switchable graphics (optimus, or whatever it's called), so
that might be related. Maybe the hardware switches from the intel GPU to the
nvidia one when the laptop screen gets deactivated? I don't see any flicker or
similiar on X or VTs though, so that's unlikely.

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