From: "Brown, Len" <len.brown@intel.com>
To: "ville.syrjala@linux.intel.com" <ville.syrjala@linux.intel.com>
CC: "Wysocki, Rafael J" <rafael.j.wysocki@intel.com>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t
Thread-Topic: [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t
Thread-Index: AQHRFbSn9iRwPHEbhkCQwt7lN1yTIZ6JRYtg
Date: Tue, 3 Nov 2015 03:04:21 +0000
Message-ID: <1A7043D5F58CCB44A599DFD55ED4C9484693D228@fmsmsx115.amr.corp.intel.com>
References: <1446499360-31984-1-git-send-email-ville.syrjala@linux.intel.com>
In-Reply-To: <1446499360-31984-1-git-send-email-ville.syrjala@linux.intel.com>
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> 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

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