(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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https://bugs.launchpad.net/bugs/1453298

Title:
  8086:0f31 Xubuntu freeze once a day

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