Fwd: [Bug 109051] intel_idle.max_cstate=1 required on baytrail to prevent crashes

[Paul Mansfield]

Everything points to the SD bus in combination with higher cstates being a
major cause of instability.

---------- Forwarded message ----------
From: <bugzilla-daemon at bugzilla.kernel.org>
Date: 21 Feb 2017 08:07
Subject: [Bug 109051] intel_idle.max_cstate=1 required on baytrail to
prevent crashes


https://bugzilla.kernel.org/show_bug.cgi?id=109051

--- Comment #734 from Hans de Goede (jwrdegoede at fedoraproject.org) ---
(In reply to Vincent Gerris from comment #732)
>  - on battery power, using an external USB (rt2573) and the internal wifi
> not connected, I could not trigger this

But you were still using the internal bluetooth, right ?

So this seems to point to a problem with the sdio wifi. I think this means
we
may still need the patches to force the CPU to not enter C4/C5 when mmc is
active which have been used by various baytrail users in the past:

https://github.com/hadess/rtl8723bs/tree/master/patches_4.5

Some patches have been merged to fix this, but IIRC their commit msg
mentioned
those patches might just make it harder to trigger the problem.

While working on some cherrytrail issues I rebased those patches to a recent
upstream kernel (not the latest, but a recent one) I've saved those rebased
patches in case we would need them again, I've uploaded them here:

https://fedorapeople.org/~jwrdegoede/trail-mmc/

It would be good to build a kernel with those and see if that fixes your
reproducable bug.

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