linux-kernel - RE: [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t

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Date:	Tue, 3 Nov 2015 03:04:21 +0000
From:	"Brown, Len" <len.brown@...el.com>
To:	"ville.syrjala@...ux.intel.com" <ville.syrjala@...ux.intel.com>
CC:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t

> Lenovo Ideapad S10-3t hangs coming out of S3 with intel_idle.
> The two workaround that seem to help are "intel_idle.max_cstate=0"
> or "nohz=off highres=off".
> 
> At a first glance quirk_tigerpoint_bm_sts() seemed promising, but
> even when moved to early_resume it didn't do anything.
> 
> I have no idea what's wrong here, so let's just disable intel_idle
> for these machines using a DMI match.

Ville, 

It is great that several workarounds have been discovered.

But it would be better to get a good idea of the root-cause
before permanently ignoring the problem via a new
black-list in the upstream kernel.

Is it possible for you to file a bug at bugzilla.kernel.org
against Product: power-management; component: intel_idle?

In it, please put the following information.

If this is a regression, the oldest kernel that broke.

When booted with intel_idle, and then without:

dmesg | grep idle
grep . /sys/devices/system/cpu/cpu0/cpuidle/*/*
# turbostat --debug sleep 10 2> turbostat.out

# cd /sys/devices/system/clocksource/clocksource0
grep . available_clocksource current_clocksource

Other boot options to test:

maxcpus=1
nohpet

intel_idle.max_cstate=3
and if that fails
intel_idle.max_cstate=2
and if that fails
intel_idle.max_cstate=1

thanks,
-Len