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?
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https://bugs.launchpad.net/bugs/1301125
Title:
Lock screen after idle time freezes unity
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