[Bug 90137] [ilk] IPS frequently downclocks the GPU when playing quakelive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90137

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, that says all you had were busy/idle calls and no interrupts. Or the
interrupt change requests were invalid.

In i915_irq.c, line 2050 we queue the RPS worker from the interrupt. That would
be a good place for the first printk to verifiy we get interrupts. The next
interesting function is ilk_compute_pm_iir() where we respond to the interrupt
and see which way to reclock the GPU.

Oh... 

gen6_pm_rps_work():
if (!dev_priv->rps.interrupts_enabled) return;

that'll explain the lack of reclocking!

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