yes! sudo ppa-purge xorg-edgers solved the problem. I installed xorg-edgers because of trying to get HDMI port working in my laptop. I didn't think that would made this sort of problem.
Thank You Timo :) ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1253529 Title: Screen in editors get corrupted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1253529/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs