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

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Message-ID: <20151108192016.GA7063@khazad-dum.debian.net>
Date:	Sun, 8 Nov 2015 17:20:16 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	"Brown, Len" <len.brown@...el.com>,
	"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

On Wed, 04 Nov 2015, Ville Syrjälä wrote:
> On Tue, Nov 03, 2015 at 03:04:21AM +0000, Brown, Len wrote:
> > > 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?
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=107151

This is a shot in the dark, but...

The Atom N450 public errata sheet is nightmare fuel, and Ville's Ideapad is
running that hellish processor on outdated microcode.

http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/atom-processor-n400-specification-update.pdf

Ville, you might want to insure you're at the latest BIOS for the S10-3t:
http://support.lenovo.com/us/en/products/laptops-and-netbooks/ideapad-s-series-netbooks/ideapad-s10-3t/downloads/DS010786

(don't bother with changelogs to make any sort of update-or-not decisions:
Lenovo changelogs are known to often be incomplete).

I also strongly recommend that you should install your distro's microcode
update package: your microcode should have been revision 0x107 or higher, it
has been in the public microcode distribution since Q2/Q3-2010...

Now, as I said, this is all a shot in the dark, and it might not help at all
with the hangs.  But it looks like something worth trying...

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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