[Bug 105949] System stall on Supermicro SKL boards on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105949

--- Comment #6 from Dmitry Ermilov <dmitry.ermilov at intel.com> ---
> Or is there another scenario which you refer to as "can't be booted"?
Yes, the third scenario is SM boards can't boot at all without
"intel_pstate=disable i915.enable_rc6=0 intel_idle.max_cstate=1".
We plan to check which exact option among these helps to boot. 
Actually this (the 3rd) scenario is the one we wanted to bring to you. Presence
of the warning is just an observation, I'm not sure if it's relevant.

> In the case where booting without the error messages, is there some other issue you see (system stall reported on bug 105949)?
Yes, it's bug 105955. Generally at first we came across bug 105955. And after
some experiments we discovered the problem described in the current bug.

> Did you try to bisect the problem causing the above error messages (noting that you need several boots for each bisect step)?
Not yet. To get the ball rolling we can try to revert
https://patchwork.freedesktop.org/patch/65235/. 

> Specifically there's been a recent related WA, could you try if the problem persists reverting that on top of drm-tip?
Sure. Thank you.

Regards,
Dmitry

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