Comment # 25 on bug 1205585 from Fabian Vogt

(In reply to Fabian Vogt from comment #23)
> My guess is that with Xvnc there's a different selection of X11 visuals
> available and the installer selects one which does not quite work with the
> font rendering method. It might be missing alpha for instance or somehow
> blend it incorrectly.

I debugged this on the train and found the root cause. It's a bad conversion
between QRgb and QRgba64 types in a gamma correct blending function. I filed a
detailed report upstream: https://bugreports.qt.io/browse/QTBUG-109169
It contains details on the debugging procedure and the root cause itself as
well as a (surprisingly small -2char) patch.

I'll try to get that upstream as well as submit it to TW soon.

I wonder whether it wouldn't be useful to drop the -depth 16 switch in the Xvnc
invocation. What's the reason for that?