Description of problem:

Running under a gnome wayland session:


If the system is active and I manually activate the lock screen by pressing Windows-L the screen immediately goes black. The backlight is turned off.

Without touching anything, 8 seconds later the screen wakes up by itself to show the blue lock screen. If I don't touch anything, that's where it stays.

If I move the mouse with the blue lock screen showing, the up-arrow hint pulses and 10 seconds later the screen goes black. The backlight is off. But again, 8 seconds later, without any interaction, the screen wakes up at the lock screen.

It cycles.


A slightly different failure mode:


If I leave the laptop idle the screen will fade to black. The backlight is turned off. 10 seconds later, without touching the anything, the backlight is turned on again but the screen is showing black or dark gray, with the pointer visible in the middle. The screen stays like this without interaction.

If I then move the mouse, the screen wakes to show the blue lock screen. After 10 seconds it goes black, and 8 seconds after that it wakes to the blue lock screen.

So idle timeout cycles like manual locking except for the first cycle, which shows a dark screen with visible pointer after 10 seconds.



In both of the above cases I have an external monitor plugged into the HDMI port of a Broadwell laptop (Thinkpad Yoga 12, all Intel). It is configured to extend the desktop, with the external monitor being the primary screen.

With the External monitor disconnected the locking appears to work as normal.

It also works under a normal X session.



Version-Release number of selected component (if applicable):

F24 with all updates as of 2016-08-14




How reproducible:

Seems repeatable as I sit here, but I don't usually run wayland.