[Intel-gfx] i915 (sandy bridge mobile) gets stuck at high power

[Andrew Lutomirski]

I've twice seen my laptop start sucking power.  Both times, turbostat (the
fancy new linux-3.8 pending version) shows GFX_W > 7.  Restarting
gnome-shell has no effect.  Suspending and resuming it seems to bring the
average power down to well under 1W.  I have no funny i915 module options
set.  I'm on 3.7-rc6.

Any ideas?
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