I also see this issue. I was hoping to switch back to open source drivers, but I need MST to work. I am also affected by Bug 1493888 but have been able to keep running since I kept my old 3.19.0-31-generic around.
I also see this issue. I was hoping to switch back to open source drivers, but I need MST to work. I am also affected by Bug 1493888 but have been able to keep running since I kept my old 3.19.0-31-generic around.