Fully updated from testing repo. Since update to plasma 5.5 I am getting periodic crashes of plasmashell -trace back below. Seems to be connected with dri/swrast_dri.so. i915 graphics so not sure why swrast_dri is called - but then again not sure what that does exactly (sounds like software rendering). Anyone got suggestions or seen similar. plasma restarts itself and things go normally for a while until the next crash. gene --- trace back Application: Plasma (plasmashell), signal: Segmentation fault Using host libthread_db library "/usr/lib/libthread_db.so.1". [Current thread is 1 (Thread 0x7f7c26ff0800 (LWP 2502))] ... Thread 1 (Thread 0x7f7c26ff0800 (LWP 2502)): [KCrash Handler] #5 0x00007f7c34c52b22 in __memmove_avx_unaligned () from /usr/lib/libc.so.6 #6 0x00007f7c1763dc8d in ?? () from /usr/lib/xorg/modules/dri/swrast_dri.so #7 0x00007f7c1763c645 in ?? () from /usr/lib/xorg/modules/dri/swrast_dri.so #8 0x00007f7c1db1e8fa in ?? () from /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so #9 0x00007f7c1db1f3f9 in ?? () from /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so #10 0x00007f7c1db1f954 in ?? () from /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so #11 0x00007f7c38652ac0 in QQuickWindowPrivate::updateDirtyNode(QQuickItem*) () from /usr/lib/libQt5Quick.so.5 #12 0x00007f7c3865331b in QQuickWindowPrivate::updateDirtyNodes() () from /usr/lib/libQt5Quick.so.5 #13 0x00007f7c38653490 in QQuickWindowPrivate::syncSceneGraph() () from /usr/lib/libQt5Quick.so.5 #14 0x00007f7c3862219c in ?? () from /usr/lib/libQt5Quick.so.5 ...