[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 #110 from Michal Feix <michal at feix.cz> ---
(In reply to Andy Furniss from comment #109)
> (In reply to Andy Furniss from comment #81)
> 
> Still up OK after 20 days back on 4.1.1.
> 
> Strange that 4.1.10 seems to be a regression, there don't seem to be any
> obvious power related i915 commits between the two. Though as I am headless
> I am not getting and i915 interrupts anyway, which makes me thing that there
> is some different CPU/IO related regression. In all the testing I did before
> when using GPU I never locked by just stressing CPU/IO until maybe just
> before I stopped testing when I could get "make modules_install" to reliably
> lock (as noted in a previous comment).

To make it even more strange - As I reported earlier, on kernel 4.2.3 my system
was unusable. I've downgraded to LTS kernel 4.1.12 and had not a single issue
since than. I'm running 4.1.12 sucessufully for more than a week now - not a
single freeze. I don't even need any pstate=disable command args any more,
which was necessary on 4.2.3 to survive more than few minutes. I haven't tested
4.1.10 though.

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