[okular] [Bug 456077] New: Severe rendering artifacts in okular after update to ubuntu 22.04 from 20.04

[Sergio]

https://bugs.kde.org/show_bug.cgi?id=456077

            Bug ID: 456077
           Summary: Severe rendering artifacts in okular after update to
                    ubuntu 22.04 from 20.04
           Product: okular
           Version: 22.04.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: sergio.callegari at gmail.com
  Target Milestone: ---

Created attachment 150224
  --> https://bugs.kde.org/attachment.cgi?id=150224&action=edit
Screenshot with the rendering issue: figure is completely missing, part of the
text is covered by an artifact

SUMMARY

The version of okular shipped with ubuntu 22.04 produces severe rendering
artifacts on a laptop with intel graphics (CometLake-U GT2 [UHD Graphics]).
Seen using an X11 session.

It is unclear to me if the issue is with okular itself or with some libraries
used by okular or in the graphics stack provided by ubuntu 22.04. Other
applications do not have similar issues, though.

STEPS TO REPRODUCE
1. Open a PDF file 
2. Repeatedly press F5  (Reload).

OBSERVED RESULT

Note that the PDF is not always rendered in the same way. In multiple occasions
parts of the page are missing, while other are covered in dark artifacts.

EXPECTED RESULT

The PDF is always rendered correctly and in the same way.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.3

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