https://bugs.kde.org/show_bug.cgi?id=502213

--- Comment #2 from php4...@gmail.com ---
Just realized something.

Normally, when the screen goes to lock, if I am quick enough to shake the
mouse, it will unlock immediately without having to insert the password. I
assume that's intended. I do that pretty often, when I'm thinking in front of
the screen and not touching keyboard and mouse, and I notice that it's going to
lock. 
I'm not sure if the password prompt is supposed to have the time to become
visible in that case (or if it's only supposed to show an empty screen and then
go back immediately to the desktop as you shake the mouse without ever
transitioning to the password prompt screen) but it definitely often does show
up for a brief moment, even though it then immediately goes away without having
to actually insert the password.

When the issue happened, this was one of those cases.

So I'm thinking: MAYBE, just maybe, there's a race condition such that, if you
shake the mouse exactly at the right (or rarther the wrong) time, just barely
after the screen has gotten locked, the system "thinks" that you shook the
mouse soon enough to prevent locking, but actually you didn't, so the password
prompt is visible (and interactive), but the system "doesn't know" that it's
required and therefore ignores it.

Maybe it's nothing like that, I don't know, it's just a hypothesis. I've seen
bugs  this stupid, I wouldn't be surprised.

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