https://bugs.documentfoundation.org/show_bug.cgi?id=127345

            Bug ID: 127345
           Summary: Impress slide show embedded video scaling/formatting
                    problem.
           Product: LibreOffice
           Version: 6.3.0.4 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: comit...@gmail.com

Description:
A slide show with embedded videos is not scaling correctly.  This seems to be
specific to a Dell XPS 13 9370.

Steps to Reproduce:
1. Create a new presentation in Impress 6.3.0.4 on a Dell XPS 13 9370 running
Fedora 30.
2. Insert a video.
3. Press F5 to run slide show.


Actual Results:
The slide show begins and the video plays, but the location is not correct
relative to where it was laid out in the editor and the video is not scaled
correctly relative to the screen size.

Expected Results:
The slide show begins and the video plays, the video is located in the correct
spot on the screen relative to where it was laid out in the editor and is
scaled to fit the box as specified in the editor.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Hardware: DELL XPS 13 9370, Intel 620 GPU with a 4k UHD touch screen.
Software: Fully up to date Fedora 30 Workstation running current stable RPM
build of Libreoffice downloaded from libreoffice.org (problem is also present
in the version that is packaged by fedora 30, as well as the version available
on flathub).

The problem happens under both wayland and xorg gnome sessions, but is actually
worse under xorg.  I have not tried it under any other desktops like KDE.

Problem happens regardless of hardware acceleration enable settings (tried
under both on and off scenarios).  I reset the user profile and tried each of
the OpenGL settings in turn. 

Problem does *NOT* happen on my desktop PC running the same version of
Fedora/LibreOffice that has a 4K screen driven by an AMD RX560 video card under
Gnome+wayland.

I will attach four screen shots plus a basic odp file with embedded videos to
demonstrate the problem.  The first image named "layout.png" shows the editor
with the expected layout of the two videos.  The second shows the problematic
slide show under wayland, the third shows the problematic slide show under
xorg.  The fourth shows the same slide show on a 1080p xorg session with the
videos located correctly.

The only workaround I have found for this problem is to use a Gnome+xorg
session and change the video settings to 1080p.

Unfortunately as this is a client's machine, I am going to be losing access to
the laptop on Saturday.  I will do my best to get additional information as
requested.

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