Hello all!
My system: Plasma 5.5 and Arch Linux, Intel HD4600 + Nvidia.
On page https://userbase.kde.org/Desktop_Effect ... il_Scaling says what with Intel driver Accurate Smooth not working, and I need set enviroment variable to see this filter.
I wrote in my ~/.profile next string

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export KWIN_USE_INTEL_SWAP_EVENT=1
export KWIN_FORCE_LANCZOS=1

After restart I have not seen this filter and my taskbar thumbnails it look very ugly



It's bug?

According to Martin Graeslin (https://blog.martin-graesslin.com/blog/. I cant find particular post) Intel graphics driver is quilt for the most Plasma 5 crashes and developers had to disable some features for this driver. Maybe accurate thumbnail scaling was one of these features.

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export KWIN_FORCE_LANCZOS=1

doesn't works for me too.
This article https://userbase.kde.org/Desktop_Effects_Performance#Thumbnail_Scaling says "By default Accurate is used. On Intel hardware Accurate is never used and cannot be enabled unless the environment variable KWIN_FORCE_LANCZOS is set to 1". But it was written for KDE 4/Plasma 4. This feature worked with KDE 4/Plasma 4 on my Intel GMA 3000 with "uxa" acceleration method (if it matters).
I think user may have an opportunity to take the responsibility to use some unsupported functions for particular hardware.
Does anybody know how to do this?

A bug report: Bug 360457 - WindowThumnail renders with QSGTexture::Nearest on at least intel chips - https://bugs.kde.org/show_bug.cgi?id=360457