drm/i915 KMS regression in Linux 3.16-rc2 (with git bisect result)

[Tom Van Braeckel]

>> There seems to be a regression in the upcoming Linux 3.16-rc2 release
>> candidate that I bisected down to this first bad commit:
>> [dbb42748ac4929987c1449ecb296b39ef8956b62] drm/i915: Move the C3 LP
>> write bit setup to gen3_init_clock_gating() for KMS.
>
> Can you attach the dmesg with rc2 and dbb4274 reverted?

Hmm, for some reason I started having a hard time reproducing the
issue on commit dbb4274.

I still have it on the 3.16-rc2 though and I'm doing another bisect.

The issue comes and goes during the bisect so let's see where it
leads... perhaps it turns out to be some configuration setting.