OK, did a rollback to 5.17.7 where Alien:Isolation still works. The segfault occurs reproducibly when I upgrade Mesa and its libs from 22.0.3-309.2 to 22.1.1-315.1 I locked Mesa to the current state and tried a zypper dup. This meant to exclude KDE5/Plasma from the update as well (i.e. stay on 5.24). However, with the rest of the system updated, I cannot start anymore; before X starts, the screen is cleared, leaving a lonely underscore cursor in the top left corner, and a dead keyboard. Had to use the Reset button, then rolled back again.