It's not fixed in the 4.8.0-generic kernel. Additionally, that kernel shows flickering artefact windows when using two monitors, as reported here: https://bugs.freedesktop.org/show_bug.cgi?id=97596
It's not fixed in the 4.8.0-generic kernel. Additionally, that kernel shows flickering artefact windows when using two monitors, as reported here: https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 97596