On Thu, Jul 7, 2016 at 10:31 AM, Frank Cox <theatre at melvilletheatre.com> wrote: > On Thu, 7 Jul 2016 10:16:23 +1000 > Venkata Balaji N wrote: > > > i left the system locked overnight. > > What are you using to lock the screen? Some of the screensavers can be > bad news on certain video cards (as I've learned the hard way) and can > cause just exactly that to happen. In that case, the screensaver has > locked up your video card. > > If this is the case, try a different screensaver. I suggest "black screen > only" for testing purposes. > I did the following and rebooted, all worked fine. I am not sure if that is the solution. [root at buildhost ~]# systemctl set-default graphical.target Regards, VB