Comment 7 for bug 150109

I have been playing with this and have determined the following
(rebooting/hard-powering-off in between tests):

Three times I tested suspending with the Intel driver. It seems to
resume correctly and then reaches the password prompt to unlock the
screen. I enter my password, press enter and it freezes. This occurred
each of the three times. Sometimes it froze while the prompt was still
on the screen, sometimes it disappeared first leaving a black screen.

I then dpkg-reconfigure xserver-xorg and changed the driver to i810.
This works perfectly and never hanged. I tried this three times with
no issues.

I then dpkg-reconfigure xserver-xorg and changed the driver to Intel.
I used the configuration editor to stop the screen locking on suspend.
I then rebooted and tried again. It behaved the same as the initial
Intel tests: appearing to work, but hanging before the desktop is
displayed - leaving a black screen.

Turning off the desktop effects makes the suspending work properly and
it does not hang.