2016-12-23 2:46 GMT-06:00 Todor Petkov <petkovptodor@gmail.com>:
> Hello,
>
Hi,

> I have the following situation:
>
> Laptop Lenovo T540p, attached to external monitor LG, and running
> Fedora25 with Mate desktop.
>
I'm using a desktop with only one monitor.
>
> After the recent upgrade from 24 to 25, after I press the combination
> for screen lock, the current monitor is being locked properly (blue
> background with the unlock dialogue). However, the other monitor is
> still showing its desktop. For example:

After upgrading from Fedora 24 to 25, when the screen goes dark and
then locked after 5 minutes of inactivity I'm still able to see the
program that was in the forefront and how it refresh its normal
activities as if the screen were not locked, then if I move the mouse
or press any key the unlock dialogue appears.

> On the external monitor I have a browser window, on the laptop monitor
> I have a chat client. The 'active' monitor is the external one (active
> means showing the active application). I press the lock keyboard
> combination, the external monitor is locked, but the laptop screen
> still shows the chat client. I can not click in it, it does not
> refresh (showing new messages), but it's still visible. If I press ESC
> several times, the "not locked" screen is refreshed and shows the
> unlock.
>
> Is this a known issue, can someone reproduce it?
>
I'm facing the same behavior in my Fedora 25 Mate Desktop upgraded
from Fedora 24 running on a desktop with one monitor. I'm not sure if
this is a new feature or a bug.