Hi Michal and Fabian, Thank you very much. I have also tracked a possibly related issue: https://bugs.kde.org/show_bug.cgi?id=392467 I will gdb LIBGL_ALWAYS_SOFTWARE=1 and, then, I will test and gdb MESA_DEBUG=incomplete_tex,incomplete_fbo,context plasmashell 2> plasmashell.log The "Missing separate debuginfo for" list is insanely huge.