** Description changed:

- Steps to repoduce:
+ [Inpact]
+ Wallpapers have an invalid aspect ratio in the lockscreen, when 
attaching/detaching monitors, while the screen is locked
+ 
+ I attached photos taken of the same screen with and without aritfacts
+ (same size, though the dots have different spacing). Wallpaper used is
+ from the current default selection.
+ 
+ [Test case]
  - Have 2 monitors/displays with different resolutions setup on your trusty 
installation. (In my case: Primary 1600x900 laptop screen and secondary 
1920x1080 external monitor.)
  - Lock the screen via shortcut.
  - Remove one monitor. (In my case: Remove the external one.)
- - Result: The display setup change is detected but the wallpaper on the 
remaining screen shows artifacts of improper resizing. Unlocking and locking 
the screen again will display the wallpaper properly resized without artifacts.
- - Settings for background images in control center are set to resize for each 
screen (the 2nd option).
+ - Result: The display setup change is detected and the wallpaper on the 
remaining screen
+   is properly resized to respect the new aspect ratio. 
  
- 
- I attached photos taken of the same screen with and without aritfacts (same 
size, though the dots have different spacing). Wallpaper used is from the 
current default selection.
+ [Regression potential]
+ None

** Description changed:

- [Inpact]
+ [Impact]
  Wallpapers have an invalid aspect ratio in the lockscreen, when 
attaching/detaching monitors, while the screen is locked
  
  I attached photos taken of the same screen with and without aritfacts
  (same size, though the dots have different spacing). Wallpaper used is
  from the current default selection.
  
  [Test case]
  - Have 2 monitors/displays with different resolutions setup on your trusty 
installation. (In my case: Primary 1600x900 laptop screen and secondary 
1920x1080 external monitor.)
  - Lock the screen via shortcut.
  - Remove one monitor. (In my case: Remove the external one.)
  - Result: The display setup change is detected and the wallpaper on the 
remaining screen
-   is properly resized to respect the new aspect ratio. 
+   is properly resized to respect the new aspect ratio.
  
  [Regression potential]
  None

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1292391

Title:
  lockscreen - wallpaper is not properly resized when unplugging
  monitors

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