On 06/17/2015 05:07 PM, Martin Gräßlin wrote:
Am 2015-06-17 14:39, schrieb David Kahles:
On 06/17/2015 05:30 AM, Martin Gräßlin wrote:
Am 2015-06-16 16:58, schrieb David Kahles:
Hello,
I want to hear some opinions about the multiscreen behavior of the lockscreen.
Currently the lockscreen is displayed on all connected monitors. I
would prefer if the
lockscreen is displayed only on the primary monitor, as it's done at
the loginscreen,
because there is no need for multiple instances.
I think this also matches the behavior of other operating
systems/desktop environments.

What do you think?
When we redid the lockscreen to be in QML with the lock always shown 
we did it that way on purpose. The main problem is that we don't 
know which screen the user is expecting it to be on. Even more we 
don't know whether the primary screen is actually the user's primary 
screen. We cannot expect users to configure it as they use it.
Easy example: notebook, external screen connected, internal screen 
is obviously the primary screen as it's a notebook. Now user closes 
the lid, screen stays configured to be on and locks the screen: at 
that point user has a broken system because lock screen is not shown 
any more. User might even try to hard turn off the system at that 
point, because user doesn't even think of the idea the closed 
notebook screen could have the locker.
So overall: if we want to be sure that users always can lock in 
again, we need to show on all screens.
That makes sense, it could save much trouble.
Out of curiosity: why should the monitor in the closed lid be
configured to stay on? The only reason that
comes to my mind is, when the lid-closed sensor is broken.
in an ideal world: not needed. In the world we live in (X11) it might 
be needed. Consider the case that I plug in an external TV to my 
notebook to watch a movie and close the lid. If it would disable the 
output, I would get about 1-2 min of freezes, becuase XRandR/Intel is 
freezing. In addition Plasma would start to shuffle everything around, 
KWin would shuffle everything around for things I don't need. I'm 
happy with all my open windows to stay on the notebook screen even if 
they are not visible to me as in that usecase the only thing that 
matters is the vlc on the big screen.
Thanks for your reply, this makes sense. Then it sounds like a good idea to have the lockscreen on all screens.
David
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