[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 #108 from Laszlo Fiat <laszlo.fiat at gmail.com> ---
(In reply to John from comment #99)
> 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 have a Z3735F baytrail tablet running Debian 8 with a 1 month old linux-next
kernel. 

I've lowered the i915_max_freq to 345 MHz, and achieved stability that way. 
No freezes since then. The Z3735F GPU has a base freq of 311 MHz, so I am
pretty close to that.

I have also patched the kernel source with a few baytrail sdhci related patches
from: https://github.com/hadess/rtl8723bs/tree/master/patches

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