Comment 12 for bug 1452318

The same here. Resume after suspend used to work well until a software update:

Start-Date: 2015-07-01 01:24:16
Commandline: aptdaemon role='role-commit-packages' sender=':1.83'
Upgrade: xserver-xorg-video-intel-lts-utopic:amd64
(2.99.914-1~exp1ubuntu4.2~trusty1, 2.99.914-1~exp1ubuntu4.3~trusty1),
unattended-upgrades:amd64 (0.82.1ubuntu2.2, 0.82.1ubuntu2.3)
End-Date: 2015-07-01 01:24:19

Since then, resume after suspend does not work well and the windows are not drawn properly.

The details of the laptop are:
ThinkPad T550
i5-5200U
Ubuntu 14.04
Gnome-fallback (I think is the same as Gnome-shell?) . Metacity in any case.

I tried to use lightgdm and gdm, but do not solve the problem. Using the proposed 2:2.99.914-1~exp1ubuntu4.5~trusty1 update do not fix the problem either. ( #134 of the bug #1432194 https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1432194 ). For the moment the only workaround is to switch from SNA to UXA ( comment #28 of the bug #1432194 ), with a lack of performance.