[okular] [Bug 415350] New: Presentation mode only renders part of a pdf on an external monitor

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=415350

            Bug ID: 415350
           Summary: Presentation mode only renders part of a pdf on an
                    external monitor
           Product: okular
           Version: 1.9.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: rien334 at gmail.com
  Target Milestone: ---

Created attachment 124586
  --> https://bugs.kde.org/attachment.cgi?id=124586&action=edit
The faulty render of the pdf on the left, the normal render on the right

SUMMARY

During my presentation yesterday, I observed that okular's presentation mode
only renders part of my pdf when the presentation window is located on an
external monitor. I've included a screenshot of how okular opens pdfs on an
external monitor in the attachment. In the screenshot, you can see that only
the top-left is shown and the rest is black (which remains so after resizes). 
For comparison, the screenshot shows the same pdf opened in normal mode, next
to the faulty rendering pdf. 

It seems to happen with any pdf.


STEPS TO REPRODUCE
1. Open any pdf, from any monitor. I can reproduce this with different
monitors, and it does not matter on which one I first open the pdf or
presentation mode.
2. Start presentation mode (Ctrl+Shift+P).
3. If the presentation window is on an external monitor, only a small part of
the pdf is shown. 

OBSERVED RESULT

Okular only renders the top-left of a pdf in presentation mode when on an
external monitor (no errors about this seem to be logged to the terminal).
Rendering on the main monitor always works fine. 

EXPECTED RESULT

The full pdf shows on the external monitor.

SOFTWARE/OS VERSIONS
Windows: Not tested
macOS: Not tested
Linux/KDE Plasma: Linux 5.4.4 (Arch Linux)
(available in About System)
KDE Plasma Version: I'm not running KDE plasma (I'm not using a DE at all).
KDE Frameworks Version: 5.65 (it happened on the version arch linux had before 
as well though).
Qt Version: 5.13.2

ADDITIONAL INFORMATION
I'm running X.Org X Server 1.20.6.

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