-- Reproducibility(disambiguation): The "issue" I was refering in the last comment was the initial bug report (i.e., with default "kstart plasmashell" ) and not on LIBGL_ALWAYS_SOFTWARE=1 plasmashell. Besides only on battery mode, I forgot to say that it only happens with nearly full ram (using swap) and on heavy i/o activity in which my system and graphic interface tends to get slow responsiveness. In my case, I'm doing my tests (on both default "kstart plasmashell" and "LIBGL_ALWAYS_SOFTWARE=1 plasmashell") now with grive sync and/or copy/paste in folder with a huge number of files in order to reproduce the problems.