[filelight] [Bug 502709] Pie chart on the right is invisible with Qt 6.9, NVIDIA graphics, and Filelight running as a Wayland application

[Darryl]

https://bugs.kde.org/show_bug.cgi?id=502709

--- Comment #26 from Darryl <ddrs at runbox.com> ---
(In reply to Kobi Hersh from comment #25)
> (In reply to pallaswept from comment #23)
> > Thank you for the tip that this was specific to nvidia/Wayland. I help
> > support a qtwebengine app which has seen issues with this lately (Qt 6.9 and
> > nvidia have not been fully working yet) so it's suddenly very familiar.
> > 
> > Be advised that the nvidia vulkan drivers (all of them currently available)
> > have a bug regarding excessive CPU utilisation, so you probably don't want
> > to set your system up to use it globally.
> > 
> > Since this is Wayland-specific, we can work around this with an environment
> > variable, and run it in XWayland until it's fixed:
> > 
> > QT_QPA_PLATFORM=xcb filelight
> 
> could you please advise a noob like me how to do that ? I tried 'set
> QT_QPA_PLATFORM=xcb filelight' and got an error message :(
> 
> setting the plasma renderer backend to 'Vulkan' also didn't stick (though I
> pressed the 'OK' button after...)

You can use KDE Menu Editor, search for Filelight, click on it, then on the
right hand side in the General tab there is an option "Environment Variables:"
enter the following: QT_QPA_PLATFORM=xcb

Then save.

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