[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 #4 from dimon at gmx.net ---
Hi Chris,

I've did some tests with your current bug90137 branch.
Last commit: 3529bfdeb1891efe9f87145f64316ae1b66cbd3b

Unfortunately the GPU doesn' reclock at all, it stays always in the slowest
P-state.
I monitored it trough /sys/kernel/debug/dri/0/i915_frequency_info
On 3.19.5 the GPU reclocks - but in a 'strange' way. 

Furthermore, ips seems not to work properly on my machine.
> cat /sys/kernel/debug/dri/0/i915_emon_status
GMCH temp: 53
Chipset power: 2916
GFX power: 21803
Total power: 24719

This is on an idling machine. The value of GFX power seems to be wrong, it's a
way to high for an idling machine.
Ips gets this value from the i915 driver and bases its decisions on it -
reclocking can't work properly without correct power values.
The power calculation is done in __i915_gfx_val - it does some magic based on
empirical values.
Is there any corresponding documentation available? So I could look whats
actually going wrong on my machine.

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