Comment 47 for bug 1437260

(In reply to Thomas Lübking from comment #43)
> Resp. this one (the ARGB32 translucency handling is uncritical, it's applied
> to the preconverted image. This should be the single point of failure)
>
> diff --git a/kcms/kfontinst/lib/FcEngine.cpp
> b/kcms/kfontinst/lib/FcEngine.cpp
> index 19b7206..012a9d5 100644
> --- a/kcms/kfontinst/lib/FcEngine.cpp
> +++ b/kcms/kfontinst/lib/FcEngine.cpp
> @@ -537,7 +537,14 @@ QImage CFcEngine::Xft::toImage(int w, int h) const
> if (!xImage) {
> return QImage();
> }
> - return QImage(xImage->data, xImage->width, xImage->height,
> xImage->stride, QImage::Format_ARGB32_Premultiplied, &cleanupXImage, xImage);
> + QImage::Format format = QImage::Format_RGB32;
> + switch (DefaultDepth(QX11Info::display(), 0)) {
> + case 32: format = QImage::Format_ARGB32_Premultiplied; break;
> + case 16: format = QImage::Format_RGB16; break;
> + case 8: format = QImage::Format_Grayscale8; break;
> + default: break;
> + }
> + return QImage(xImage->data, xImage->width, xImage->height,
> xImage->stride, format, &cleanupXImage, xImage);
> }
>
> inline int point2Pixel(int point)

I use Fedora 23 and I have same problem (see comment 9)

I rebuild the fedora's rpm with your patch (plasma-desktop-5.5.3-2.fc23.x86_64.rpm), and now all work fine, I can see the font in system settings.
Thank for that.