[Bug 88012] [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88012

--- Comment #99 from John <jbmacbrodie at yahoo.com> ---
To cap frequency I read the max (779 for mine) from 

cat /sys/class/drm/card0/gt_max_freq_mhz

To set pick a lower value (as root)

echo 423 > /sys/kernel/debug/dri/0/i915_max_freq

I tried lower values in 100 Mhz steps until I found stability (to 423 in my
case).  

I think you could just put back to the gt_max but this worked for me.

This value resets each boot, and the driver rounds the value to something
close.

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