This happens every time and it's NOT an issue with opencl/opengl libraries, NVidia's proprietary driver or underlying hardware capabilities, it's a BUG in the check which is done prior to launching Kwin. The same configuration and libraries are working great when running other Desktop Environments while using the same libraries and drivers. i.e. I can run World of Warcraft flawlessly with wine with opengl-3.1 from LxQT. You can see more complaints here: https://forums.gentoo.org/viewtopic-t-1048616-start-0.html
This check is not done by KWin
(In reply to Martin Gräßlin from comment #1) > This check is not done by KWin Yes, you're right, this check is done in: void ShellCorona::showOpenGLNotCompatibleWarning() { ... plasma-workspace/shell/shellcorona.cpp:1998 ... I'll try to reassign the bug to their area.
*** This bug has been marked as a duplicate of bug 375730 ***