[Intel-gfx] Broadwell i915 VT behavior on resume from sleep

[Steven Noonan]

Running 3.19.3 on a Broadwell ThinkPad X250.

I'm running into some unfortunate behaviour. When I resume from sleep,
the GPU occasionally hangs:

https://bugs.freedesktop.org/show_bug.cgi?id=89896

And I also have this issue with the virtual terminals after I resume
(reproduced by doing a suspend/resume followed by a reboot):

https://www.youtube.com/watch?v=wRaq4SaEnOI

Not sure what I'd say in a bug report for this issue. VTs behave fine
if I haven't suspend/resumed at all.