[Libreoffice-bugs] [Bug 133739] New: OpenGL transitions are flashing in an unexpected manner

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=133739

            Bug ID: 133739
           Summary: OpenGL transitions are flashing in an unexpected
                    manner
           Product: LibreOffice
           Version: 6.4.4.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rafael.palma.lima at gmail.com

Description:
Transitions that rely on OpenGL such as Fade, Iris and Circles do not work as
expected. Rather they show a weird flashy effect.

Steps to Reproduce:
1.Create a new Impress presentation with two slides
2.Insert text and objects in both slides
3.Apply the "Fade" transition to the second slide
4.Press F5 to start the presentation
5.Move from first to second slide

Actual Results:
The move to the second slide shows a weird effect, instead of the expected Fade
transition.

Expected Results:
I expected the Flash transition without these weird flashing of the screen.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
I posted a video on Youtube showing the transition effect:

https://youtu.be/ocspMGvPHaY

My computer runs Ubuntu 20.04 and I am using the PPA version of LibreOffice. I
have a NVidia GTX 1660 video card.

I also experienced this problem in all releases of the 6.4 branch. I am also
testing the 7.0 beta 1 version and this problem keeps happening.

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