Comment 32 for bug 1301125

I also have this issue. At work I need to use too many tools so turning the laptop off at the end of each day and turning it on while starting all the applications and arranging them on the screens (I use 3) is a no go. Therefore I suspend the computer (simply by closing the laptop's lid). Very often after opening the lid and waking up the computer the login screen is frozen - either in a way that I can use my mouse but cannot gain focus after clicking into the login field (also just typing the password and confirming by Enter key does not work) or that the screens are split from one half of one monitor to the half of the screen on the other monitor.

To be able to use 3 monitors with Ubuntu 14.04 (one laptop's + 2 monitors) I had to upgrade the kernel and install the Intel graphic drivers.

Kernel version: 3.17.0-031700-generic
Intel drivers: *-display
       description: VGA compatible controller
       product: Haswell-ULT Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0b
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:46 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)

I used these resources to upgrade the kernel and install the Intel drivers: http://ubuntuhandbook.org/index.php/2014/10/install-upgrade-kernel-3-17-ubuntu/ and http://askubuntu.com/questions/141606/how-to-fix-the-system-is-running-in-low-graphics-mode-error

Though there is no problem with the setup I am not sure whether it may lead to problems with lightdm and freezing. I am still trying to keep the system up-to-date. Any ideas?