window placement problem on external monitor above laptop monitor

[DCBuist]

In display settings, an external monitor is moved from the default position to the right of the main monitor to a position above the main monitor. Windows opened or dragged onto the external monitor now cannot be placed in the centre of the display. When attempting to drag them towards the centre they suddenly jump across the screen and reappear on the other side. (See attached video)

The problem is not observed when the external monitor is arranged to the right of the main laptop display. It occurs only when the external display is placed above the main display as described above.

The amount of screen area on which windows cannot be placed is dependent on the size of the window. In other words, smaller windows jump more than larger ones. (This is also illustrated in the video)

Window snapping is disabled.

Hardware specs are as follows:
Computer: Dell Latitude 7370
GPU: Intel HD Graphics 515
External monitor: Dell P2715Q (Resolution 3840x2160)

The external monitor can be connected one of two ways: via a USB-C docking station or directly to the mini-hdmi port on the computer. The problem described above occurs regardless of how the external monitor is attached.

I am currently running Ubuntu MATE 17.10. The problem was also observed in 17.04 and 16.10.

The problem only occurs while using Marco. After switching to Compiz, windows dragged around on the external display move as expected.

[Martin Wimpress  (flexiondotorg)]

What window manager are you using?

[DCBuist (dcbug)]

Marco

----- Original Message -----
> What window manager are you using?
>
> ** Changed in: ubuntu-mate
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the
bug
> report.
> https://bugs.launchpad.net/bugs/1694350
>
> Title:
> window placement problem on external monitor above laptop monitor
>
> Status in ubuntu-mate:
> Incomplete
>
> Bug description:
> In display settings, an external monitor is moved from the default
> position to the right of the main monitor to a position above the
main
> monitor. Windows opened or dragged onto the external monitor now
> cannot be placed in the centre of the display. When attempting to
drag
> them towards the centre they suddenly jump across the screen and
> reappear on the other side. (See attached video)
>
> The problem is not observed when the external monitor is arranged to
> the right of the main laptop display. It occurs only when the
external
> display is placed above the main display as described above.
>
> The amount of screen area on which windows cannot be placed is
> dependent on the size of the window. In other words, smaller windows
> jump more than larger ones. (This is also illustrated in the video)
>
> Window snapping is disabled.
>
> Hardware specs are as follows:
> Computer: Dell Latitude 7370
> GPU: Intel HD Graphics 515
> External monitor: Dell P2715Q (Resolution 3840x2160)
>
> The external monitor can be connected one of two ways: via a USB-C
> docking station or directly to the mini-hdmi port on the computer.
The
> problem described above occurs regardless of how the external
monitor
> is attached.
>
> I am currently running Ubuntu MATE 17.04. The problem was also
> observed in 16.10.
>
> The problem does not occur in other distros with the same hardware.
> (Other distros tried so far are Antergos, OpenSuSE, Kaos and Kubuntu.
)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu-mate/+bug/1694350/+subscriptions
>

[Launchpad Janitor (janitor)]

[Expired for ubuntu-mate because there has been no activity for 60 days.]

[DCBuist (dcbug)]

The same problem is observed in Ubuntu MATE 17.10 installed on the the same hardware as detailed in my original bug report, but only when using Marco. The problem goes away after switching to Compiz.