Display settings not updated after wakeup from standby (Xubuntu 15.04)

Submitted by Daniel

Assigned to Eric Koegel

Link to original bug (#12455)

Description

(Sorry, don't know if this is the right subproject; could not find anything obvious.)

When I have my laptop attached to the docking station at work, I use the laptop display as secondary screen and an additional monitor as the primary screen.

Through "settings / display", I have been able to extend the display from the primary screen to the secondary/laptop screen, so that they appear as one desktop.

Now, whenever I send the laptop to standby and take it home or to a client and wake it up, the system still believes that the primary monitor is attached. The laptop screen still shows only the right part of the desktop. I see no icons, no windows from the primary screen, and not even a launcher bar. I have to open "settings / display" manually from deep inside the context menu that opens after right-clicking on the desktop background. As soon as the dialog pops up, the system notices that the primary display is gone, reinitializes the desktop, and I can just close the settings dialog without making any changes there.

Although this "workaround" solves the issue, it would be helpful if the system (like many others already do) could run a screen detection or desktop re-initialization as soon as it recovers from standby, without the user having to initiate that manually.