[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 #109 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Andy Furniss from comment #81)

<snip>

> Recently needed to re-locate and while doing so updated to 4.1.10 = hard
> lock after 7 days uptime. The kernel was not the only difference as I
> attached a usb printer and so have usb module and cups running now, though
> the printer had been off for days when it locked.
> 
> Anyway I am back on 4.1.1 now (with printer) and will have to see how long
> it lasts to be sure whether the kernel or the printer (or the move!) was the
> cause.

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).

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