Fwd: [Bug 109051] intel_idle.max_cstate=1 required to prevent crashes - Baytrail

[Nicolas Huillard]

Le mardi 28 mai 2019 à 18:17 +0100, Paul Mansfield a écrit :
> ---------- Forwarded message ---------
> From: <bugzilla-daemon at bugzilla.kernel.org>
> Date: Tue, 28 May 2019 at 16:54
> Subject: [Bug 109051] intel_idle.max_cstate=1 required to prevent
> crashes - Baytrail
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=109051
> 
> --- Comment #1001 from D. Hugh Redelmeier (hugh at mimosa.com) ---
> The patch says it only applies to "Valleyview" systems.  As far as I
> can tell,
> that includes all Bay Trail chips, and nothing else.  Comments about
> other
> systems should be disregarded.
> 
> https://ark.intel.com/content/www/us/en/ark/products/codename/55844/b
> ay-trail.html
> 
> The patch is self-described as a work-around.  This is a tacit
> admission of a
> chip bug.  With no fix for over 4 years.  At least they didn't give
> up.

As I understand it, there will be a patch in kernel 5.3 that is a bit
more smarter than just passing intel_idle.max_cstate=1 as a boot
parameter. This patch works around some power unit bug inside the CPU
or on the mainboard, and will also probably allow putting the device on
sleep, along with preventing random freezes.

In the meantime, I bought a cheap Thinkpad x230, which is 50% heavier,
much larger but still portable enough, and brought absolutely 0 problem
 with Linux... I still like the tiny TCM, but can't use it except as an
on-the-move emergency terminal.

-- 
Nicolas Huillard