This affects me too. Oddly, if I swap to using gnome-shell instead of
Unity this fixes this problem.
For the moment I've changed to using gnome-shell since this happens too
frequently.
This problem started occurring for me with the last round of trusty
updates using the utopic HWE -
apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
Installed: (none)
Candidate: 2:2.99.910-0ubuntu1.6
Version table:
2:2.99.910-0ubuntu1.6 0
500 http://ubuntu.mirrors.uk2.net/ubuntu/ trusty-updates/main amd64
Packages
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https://bugs.launchpad.net/bugs/1342675
Title:
Random characters in screen text suddenly disappear
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1342675/+subscriptions
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