Resuming the computer from locked screen sometimes ends up distorting the display.
It happens randomly and restarting the computer is one workaround for it.
I tried this : ALT+F2 ,then type “unity”. Didn't solve the problem.
The issue does not appear on screen shots. I took a picture with my mobile to get this.
I am using X.org X server - AMD/ATI display driver wrapper from xserver-xorg-video-ati.
Any idea why might be going wrong?
UPDATE: Changed the graphic driver to use proprietary driver. Hope it solves the problem. [It didn't]
UPDATE2: Found another work around. Suspend the computer and then resume it. Works fine after that.